We're dividing 643739 by 7 
Let's see how many times 7 fits into 643739.

Moving on to step 1:
The number 7 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 7

Going ahead to step 2:
When dividing 64 by 7, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 1 after subtracting 63 from 64.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 7

Step 3:
13 divided by 7 is 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
If we subtract 7 from 13, we get 6.
Grab the next digit (7) from the dividend, add it to 6, then carry on: 67 / 7

On to step 4:
67 divided by 7 is 9 with a remainder of 4.
The next digit of our result is 9. 
Result so far: 919.0
If we subtract 63 from 67, we get 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 7

Moving on to step 5:
43 divided by 7 is 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 9196.0
If we take 42 away from 43, we end up with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 7

Going ahead to step 6:
If we divide 19 by 7, we get 2 and a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 91962.0
If we subtract 14 from 19, 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.

Moving on to step 7:
When dividing 50 by 7, we get 7 with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 91962.7
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:
If we divide 10 by 7, we get 1 and a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 91962.71
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.

Let's proceed to step 9:
The number 7 fits into 30 4 times, leaving a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 91962.714
If we take 28 away from 30, we end up 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.

Step 10:
20 divided by 7 is 2 with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 91962.7142
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.

Step 11:
7 goes into 60 8 times with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 91962.71428
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.

Let's proceed to step 12:
7 goes into 40 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 91962.714285
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.

On to step 13:
When dividing 50 by 7, we get 7 with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 91962.7142857
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 14:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 91962.71428571
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.

The final outcome is 91962.71428571, with a leftover of 3e-09.