We look at the division of 764739 by 21 
We want to figure out the number of times 764739 can be divided by 21.

Advancing to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 21

Step 2:
If we divide 76 by 21, we get 3 and a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 76, we get 13.
Grab the next digit (4) from the dividend, add it to 13, then carry on: 134 / 21

On to step 3:
The number 21 fits into 134 6 times, leaving a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
If we take 126 away from 134, we end up with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 21

On to step 4:
The number 21 fits into 87 4 times, leaving a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 364.0
Deduct 84 from 87 and we're left with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 21

Let's proceed to step 5:
21 goes into 33 1 times with a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 3641.0
If we take 21 away from 33, we end up with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 21

Moving on to step 6:
21 goes into 129 6 times with a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 36416.0
Subtract 126 from 129 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.

Moving on to step 7:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 36416.1
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 36416.14
If we subtract 84 from 90, 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.

Going ahead to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 36416.142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
If we divide 180 by 21, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 36416.1428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
When dividing 120 by 21, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 36416.14285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 12:
When dividing 150 by 21, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 36416.142857
The remainder is 3 after subtracting 147 from 150.
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:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 36416.1428571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 14:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 36416.14285714
Deduct 84 from 90 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.

After the division, we end up with 36416.14285714 and a remainder of 6e-09.