921539 ÷ 7 
The aim is to understand the frequency of 7 in 921539.

Step 1:
7 can be fit into 9 1 times, resulting in a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 7 away from 9, we end up with 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 7

Let's proceed to step 2:
The number 7 fits into 22 3 times, leaving a remainder of 1.
The next digit of our result is 3. 
Result so far: 13.0
Subtracting 21 from 22 leaves us with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 7

On to step 3:
The number 7 fits into 11 1 times, leaving a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 131.0
Deduct 7 from 11 and we're left with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 7

Let's proceed to step 4:
45 divided by 7 is 6 with a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 1316.0
Subtracting 42 from 45 leaves us with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 7

Going ahead to step 5:
The number 7 fits into 33 4 times, leaving a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 13164.0
If we subtract 28 from 33, we get 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 7

Step 6:
When dividing 59 by 7, we get 8 with a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 131648.0
The remainder is 3 after subtracting 56 from 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
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: 131648.4
Subtract 28 from 30 to 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.

Advancing to step 8:
The number 7 fits into 20 2 times, leaving a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 131648.42
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 9:
7 goes into 60 8 times with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 131648.428
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 10:
The number 7 fits into 40 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 131648.4285
Deduct 35 from 40 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.

On to step 11:
50 divided by 7 is 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 131648.42857
The remainder is 1 after subtracting 49 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 12:
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: 131648.428571
The remainder is 3 after subtracting 7 from 10.
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 13:
30 divided by 7 is 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 131648.4285714
Subtract 28 from 30 to 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.

On to step 14:
7 goes into 20 2 times with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 131648.42857142
The remainder is 6 after subtracting 14 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 131648.42857142 with a balance of 6e-09.