We're dividing 75351240 by 129 
Our goal is to divide 75351240 by 129.

Step 1:
The number 129 fits into 7 0 times, leaving a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 129

On to step 2:
The number 129 fits into 75 0 times, leaving a remainder of 75.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 75 after subtracting 0 from 75.
Bring next digit (3) of the dividend behind the 75 and repeat the process: 753 / 129

Moving on to step 3:
129 can be fit into 753 5 times, resulting in a remainder of 108.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 645 from 753 and we're left with 108.
Include the next digit (5) from the dividend after 108, then repeat: 1085 / 129

On to step 4:
129 goes into 1085 8 times with a remainder of 53.
Use 8 as the next digit of our solution. 
Result so far: 58.0
If we subtract 1032 from 1085, we get 53.
Append the next digit (1) from the dividend to 53 and continue with: 531 / 129

On to step 5:
If we divide 531 by 129, we get 4 and a remainder of 15.
Write down 4 as next digit of the result. 
Result so far: 584.0
If we take 516 away from 531, we end up with 15.
Bring next digit (2) of the dividend behind the 15 and repeat the process: 152 / 129

On to step 6:
129 can be fit into 152 1 times, resulting in a remainder of 23.
The number 1 becomes the next digit in our result. 
Result so far: 5841.0
Subtract 129 from 152 to get 23.
Take the next digit (4) from the dividend and append it to 23, then repeat: 234 / 129

Going ahead to step 7:
When dividing 234 by 129, we get 1 with a remainder of 105.
Record the quotient 1 as the next digit in the result. 
Result so far: 58411.0
If we subtract 129 from 234, we get 105.
Append the next digit (0) from the dividend to 105 and continue with: 1050 / 129

Let's proceed to step 8:
129 can be fit into 1050 8 times, resulting in a remainder of 18.
Write down 8 as next digit of the result. 
Result so far: 584118.0
If we subtract 1032 from 1050, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 9:
129 goes into 180 1 times with a remainder of 51.
The next digit of our result is 1. 
Result so far: 584118.1
If we take 129 away from 180, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 10:
129 can be fit into 510 3 times, resulting in a remainder of 123.
Use 3 as the next digit of our solution. 
Result so far: 584118.13
If we subtract 387 from 510, we get 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Going ahead to step 11:
129 can be fit into 1230 9 times, resulting in a remainder of 69.
The next digit of our result is 9. 
Result so far: 584118.139
Subtracting 1161 from 1230 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 12:
690 divided by 129 is 5 with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 584118.1395
If we subtract 645 from 690, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 13:
129 goes into 450 3 times with a remainder of 63.
Put 3 as the next digit of the answer. 
Result so far: 584118.13953
Subtracting 387 from 450 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 14:
630 divided by 129 is 4 with a remainder of 114.
Put 4 as the next digit of the answer. 
Result so far: 584118.139534
If we subtract 516 from 630, we get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Advancing to step 15:
The number 129 fits into 1140 8 times, leaving a remainder of 108.
Use 8 as the next digit of our solution. 
Result so far: 584118.1395348
Subtract 1032 from 1140 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Advancing to step 16:
129 can be fit into 1080 8 times, resulting in a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 584118.13953488
Subtract 1032 from 1080 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 584118.13953488 and a remainder of 4.8e-08.