We look at the division of 15332775 by 7 
The aim is to understand the frequency of 7 in 15332775.

Advancing to step 1:
When dividing 1 by 7, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 7

Going ahead to step 2:
When dividing 15 by 7, we get 2 with a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 14 from 15 leaves us with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 7

Moving on to step 3:
When dividing 13 by 7, we get 1 with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Deduct 7 from 13 and we're left with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 7

Step 4:
When dividing 63 by 7, we get 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 219.0
The remainder is 0 after subtracting 63 from 63.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 7

Moving on to step 5:
7 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 2190.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 7

Let's proceed to step 6:
7 can be fit into 27 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 21903.0
Deduct 21 from 27 and we're left with 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 7

On to step 7:
The number 7 fits into 67 9 times, leaving a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 219039.0
Subtract 63 from 67 to get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 7

Step 8:
When dividing 45 by 7, we get 6 with a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 2190396.0
If we take 42 away from 45, 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.

Advancing to step 9:
The number 7 fits into 30 4 times, leaving a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 2190396.4
Subtracting 28 from 30 leaves us 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.

Advancing to step 10:
If we divide 20 by 7, we get 2 and a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 2190396.42
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.

Advancing to step 11:
7 can be fit into 60 8 times, resulting in a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 2190396.428
Subtract 56 from 60 to 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.

Let's proceed to 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: 2190396.4285
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.

Let's proceed to step 13:
7 goes into 50 7 times with a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 2190396.42857
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.

Going ahead to step 14:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 2190396.428571
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 15:
7 can be fit into 30 4 times, resulting in a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 2190396.4285714
If we subtract 28 from 30, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 16:
7 goes into 20 2 times with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 2190396.42857142
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.

The quotient of the division is 2190396.42857142, and the remainder is 6e-09.