72979655 divided by 7 
The aim is to understand the frequency of 7 in 72979655.

On to step 1:
If we divide 7 by 7, we get 1 and a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 7 away from 7, we end up with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 7

On to step 2:
If we divide 2 by 7, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 7

Moving on to step 3:
29 divided by 7 is 4 with a remainder of 1.
The next digit of our result is 4. 
Result so far: 104.0
If we subtract 28 from 29, we get 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 7

Advancing to step 4:
The number 7 fits into 17 2 times, leaving a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 1042.0
Subtracting 14 from 17 leaves us with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 7

Moving on to step 5:
When dividing 39 by 7, we get 5 with a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 10425.0
The remainder is 4 after subtracting 35 from 39.
Take the next digit (6) from the dividend and append it to 4, then repeat: 46 / 7

Moving on to step 6:
7 goes into 46 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 104256.0
If we subtract 42 from 46, we get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 7

Step 7:
When dividing 45 by 7, we get 6 with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 1042566.0
Subtracting 42 from 45 leaves us with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 7

Step 8:
35 divided by 7 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10425665.0
Deduct 35 from 35 and we're left 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.

On to step 9:
0 divided by 7 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10425665.0
If we take 0 away from 0, 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 10:
If we divide 0 by 7, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10425665.0
Subtracting 0 from 0 leaves us 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.

The final outcome is 10425665.0, with a leftover of 0.0.