643679 divided by 7 
The aim is to understand the frequency of 7 in 643679.

Moving on to step 1:
7 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 7

Step 2:
When dividing 64 by 7, we get 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 63 from 64 and we're left with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 7

Moving on to step 3:
7 can be fit into 13 1 times, resulting in a remainder of 6.
The next digit of our result is 1. 
Result so far: 91.0
If we take 7 away from 13, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 7

Advancing to step 4:
7 can be fit into 66 9 times, resulting in a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 919.0
Deduct 63 from 66 and we're left with 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 7

Going ahead to step 5:
If we divide 37 by 7, we get 5 and a remainder of 2.
The next digit of our result is 5. 
Result so far: 9195.0
If we subtract 35 from 37, we get 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 7

Let's proceed to step 6:
The number 7 fits into 29 4 times, leaving a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 91954.0
Subtracting 28 from 29 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.

Step 7:
When dividing 10 by 7, we get 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 91954.1
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 8:
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: 91954.14
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.

On to step 9:
7 goes into 20 2 times with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 91954.142
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.

On to step 10:
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: 91954.1428
Subtracting 56 from 60 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.

Let's proceed to step 11:
When dividing 40 by 7, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 91954.14285
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.

Moving on to step 12:
7 can be fit into 50 7 times, resulting in a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 91954.142857
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.

Going ahead to step 13:
10 divided by 7 is 1 with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 91954.1428571
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.

Let's proceed to step 14:
If we divide 30 by 7, we get 4 and a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 91954.14285714
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.

In conclusion, the division gives 91954.14285714 with a balance of 2e-09.