We look at the division of 641429 by 7 
The aim is to understand the frequency of 7 in 641429.

Advancing to step 1:
7 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 7

Let's proceed to step 2:
The number 7 fits into 64 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we subtract 63 from 64, we get 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 7

On to step 3:
If we divide 11 by 7, we get 1 and a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 91.0
If we subtract 7 from 11, we get 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 7

On to step 4:
If we divide 44 by 7, we get 6 and a remainder of 2.
The next digit of our result is 6. 
Result so far: 916.0
If we subtract 42 from 44, we get 2.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 7

On to step 5:
When dividing 22 by 7, we get 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 9163.0
If we subtract 21 from 22, we get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 7

Let's proceed to step 6:
19 divided by 7 is 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 91632.0
If we take 14 away from 19, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
The number 7 fits into 50 7 times, leaving a remainder of 1.
The next digit of our result is 7. 
Result so far: 91632.7
The remainder is 1 after subtracting 49 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 8:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 91632.71
Subtract 7 from 10 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 9:
The number 7 fits into 30 4 times, leaving a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 91632.714
If we take 28 away from 30, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
When dividing 20 by 7, we get 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 91632.7142
Subtracting 14 from 20 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 11:
The number 7 fits into 60 8 times, leaving a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 91632.71428
Subtracting 56 from 60 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
40 divided by 7 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 91632.714285
Subtract 35 from 40 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
If we divide 50 by 7, we get 7 and a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 91632.7142857
Subtract 49 from 50 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 14:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 91632.71428571
If we take 7 away from 10, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Our division results in 91632.71428571 with a remaining 3e-09.