We look at the division of 763578 by 7 
The aim is to understand the frequency of 7 in 763578.

On to step 1:
The number 7 fits into 7 1 times, leaving a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 7 from 7 and we're left with 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 7

Moving on to step 2:
When dividing 6 by 7, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 7

Going ahead to step 3:
7 can be fit into 63 9 times, resulting in a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 109.0
The remainder is 0 after subtracting 63 from 63.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 7

Step 4:
If we divide 5 by 7, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 1090.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 7

On to step 5:
The number 7 fits into 57 8 times, leaving a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 10908.0
Subtracting 56 from 57 leaves us with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 7

Let's proceed to step 6:
7 goes into 18 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 109082.0
Deduct 14 from 18 and we're left 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.

Going ahead to step 7:
When dividing 40 by 7, we get 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 109082.5
If we subtract 35 from 40, we 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 8:
When dividing 50 by 7, we get 7 with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 109082.57
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.

On to step 9:
The number 7 fits into 10 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 109082.571
Subtracting 7 from 10 leaves us 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.

Advancing to step 10:
When dividing 30 by 7, we get 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 109082.5714
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 11:
The number 7 fits into 20 2 times, leaving a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 109082.57142
Subtract 14 from 20 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
7 goes into 60 8 times with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 109082.571428
If we subtract 56 from 60, we get 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 13:
The number 7 fits into 40 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 109082.5714285
If we take 35 away from 40, 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.

Let's proceed to step 14:
When dividing 50 by 7, we get 7 with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 109082.57142857
If we take 49 away from 50, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 109082.57142857 with a remainder of 1e-09.