5991200 ÷ 7 
The aim is to understand the frequency of 7 in 5991200.

Advancing to step 1:
The number 7 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 7

Moving on to step 2:
7 goes into 59 8 times with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 56 from 59 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 7

Let's proceed to step 3:
7 goes into 39 5 times with a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 85.0
Subtract 35 from 39 to get 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 7

On to step 4:
7 can be fit into 41 5 times, resulting in a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 855.0
If we subtract 35 from 41, we get 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 7

On to step 5:
The number 7 fits into 62 8 times, leaving a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 8558.0
If we take 56 away from 62, we end up with 6.
Append the next digit (0) from the dividend to 6 and continue with: 60 / 7

On to step 6:
7 can be fit into 60 8 times, resulting in a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 85588.0
Deduct 56 from 60 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 7

Let's proceed to step 7:
If we divide 40 by 7, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 855885.0
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.

Step 8:
7 goes into 50 7 times with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 855885.7
Subtracting 49 from 50 leaves us 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 9:
The number 7 fits into 10 1 times, leaving a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 855885.71
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.

Going ahead to step 10:
The number 7 fits into 30 4 times, leaving a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 855885.714
The remainder is 2 after subtracting 28 from 30.
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 11:
7 goes into 20 2 times with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 855885.7142
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.

Step 12:
60 divided by 7 is 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 855885.71428
The remainder is 4 after subtracting 56 from 60.
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 13:
7 can be fit into 40 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 855885.714285
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.

Step 14:
7 can be fit into 50 7 times, resulting in a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 855885.7142857
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 15:
If we divide 10 by 7, we get 1 and a remainder of 3.
The next digit of our result is 1. 
Result so far: 855885.71428571
Deduct 7 from 10 and we're left 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.

In conclusion, the division gives 855885.71428571 with a balance of 3e-09.