We look at the division of 30129831 by 7 
The aim is to understand the frequency of 7 in 30129831.

Going ahead to step 1:
When dividing 3 by 7, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 7

Advancing to step 2:
30 divided by 7 is 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 28 from 30 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 7

Step 3:
7 can be fit into 21 3 times, resulting in a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Deduct 21 from 21 and we're left with 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 7

Advancing to step 4:
2 divided by 7 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 430.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 7

Moving on to step 5:
If we divide 29 by 7, we get 4 and a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4304.0
Subtract 28 from 29 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 7

On to step 6:
The number 7 fits into 18 2 times, leaving a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 43042.0
If we take 14 away from 18, we end up with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 7

Let's proceed to step 7:
7 can be fit into 43 6 times, resulting in a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 430426.0
The remainder is 1 after subtracting 42 from 43.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 7

Step 8:
11 divided by 7 is 1 with a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 4304261.0
Subtracting 7 from 11 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.

On to step 9:
7 goes into 40 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 4304261.5
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.

Let's proceed to step 10:
7 goes into 50 7 times with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 4304261.57
Deduct 49 from 50 and we're left 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.

Let's proceed to step 11:
The number 7 fits into 10 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 4304261.571
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.

Moving on to step 12:
When dividing 30 by 7, we get 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4304261.5714
Deduct 28 from 30 and we're left 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 13:
7 can be fit into 20 2 times, resulting in a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 4304261.57142
If we subtract 14 from 20, we 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.

Advancing to step 14:
When dividing 60 by 7, we get 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 4304261.571428
Deduct 56 from 60 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.

Step 15:
7 goes into 40 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 4304261.5714285
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.

Advancing to step 16:
7 goes into 50 7 times with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 4304261.57142857
Deduct 49 from 50 and we're left 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.

In conclusion, the division gives 4304261.57142857 with a balance of 1e-09.