We look at the division of 421104 by 75 
The aim is to understand the frequency of 75 in 421104.

Advancing to step 1:
4 divided by 75 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 75

Step 2:
42 divided by 75 is 0 with a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Take the next digit (1) from the dividend and append it to 42, then repeat: 421 / 75

Going ahead to step 3:
If we divide 421 by 75, we get 5 and a remainder of 46.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 375 from 421, we get 46.
Include the next digit (1) from the dividend after 46, then repeat: 461 / 75

Going ahead to step 4:
If we divide 461 by 75, we get 6 and a remainder of 11.
Write down 6 as next digit of the result. 
Result so far: 56.0
The remainder is 11 after subtracting 450 from 461.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 75

Moving on to step 5:
When dividing 110 by 75, we get 1 with a remainder of 35.
Write down 1 as next digit of the result. 
Result so far: 561.0
If we subtract 75 from 110, we get 35.
Include the next digit (4) from the dividend after 35, then repeat: 354 / 75

Let's proceed to step 6:
75 can be fit into 354 4 times, resulting in a remainder of 54.
Put 4 as the next digit of the answer. 
Result so far: 5614.0
The remainder is 54 after subtracting 300 from 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
When dividing 540 by 75, we get 7 with a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 5614.7
Subtract 525 from 540 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
When dividing 150 by 75, we get 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 5614.72
If we take 150 away from 150, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
0 divided by 75 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 5614.72
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
75 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 5614.72
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 5614.72 with a remaining 0.0.