We look at the division of 275553 by 7 
The aim is to understand the frequency of 7 in 275553.

Going ahead to step 1:
When dividing 2 by 7, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 7

On to step 2:
27 divided by 7 is 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 21 from 27 and we're left with 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 7

Step 3:
When dividing 65 by 7, we get 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we take 63 away from 65, we end up with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 7

Moving on to step 4:
The number 7 fits into 25 3 times, leaving a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 393.0
Subtracting 21 from 25 leaves us with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 7

Step 5:
When dividing 45 by 7, we get 6 with a remainder of 3.
Put 6 as the next digit of the answer. 
Result so far: 3936.0
If we subtract 42 from 45, we get 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 7

On to step 6:
7 can be fit into 33 4 times, resulting in a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 39364.0
Deduct 28 from 33 and we're left 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.

Step 7:
The number 7 fits into 50 7 times, leaving a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 39364.7
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.

Going ahead to step 8:
10 divided by 7 is 1 with a remainder of 3.
The next digit of our result is 1. 
Result so far: 39364.71
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 9:
7 can be fit into 30 4 times, resulting in a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 39364.714
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.

Let's proceed to step 10:
20 divided by 7 is 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 39364.7142
Deduct 14 from 20 and we're left 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.

Let's proceed to step 11:
The number 7 fits into 60 8 times, leaving a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 39364.71428
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.

Moving on to step 12:
7 can be fit into 40 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 39364.714285
The remainder is 5 after subtracting 35 from 40.
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 13:
When dividing 50 by 7, we get 7 with a remainder of 1.
The next digit of our result is 7. 
Result so far: 39364.7142857
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.

Let's proceed to step 14:
7 can be fit into 10 1 times, resulting in a remainder of 3.
The next digit of our result is 1. 
Result so far: 39364.71428571
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.

The final result is 39364.71428571 with a remainder of 3e-09.