We look at the division of 75861293 by 21 
We're looking to find how many times 21 goes into 75861293.

On to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 21

Advancing to step 2:
If we divide 75 by 21, we get 3 and a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 63 from 75 leaves us with 12.
Grab the next digit (8) from the dividend, add it to 12, then carry on: 128 / 21

Advancing to step 3:
The number 21 fits into 128 6 times, leaving a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Subtract 126 from 128 to get 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 21

Step 4:
26 divided by 21 is 1 with a remainder of 5.
The next digit of our result is 1. 
Result so far: 361.0
Subtract 21 from 26 to get 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 21

Moving on to step 5:
When dividing 51 by 21, we get 2 with a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 3612.0
Subtracting 42 from 51 leaves us with 9.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 21

Let's proceed to step 6:
21 can be fit into 92 4 times, resulting in a remainder of 8.
The next digit of our result is 4. 
Result so far: 36124.0
Subtracting 84 from 92 leaves us with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 21

Advancing to step 7:
21 goes into 89 4 times with a remainder of 5.
The next digit of our result is 4. 
Result so far: 361244.0
If we subtract 84 from 89, we get 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 21

Going ahead to step 8:
21 goes into 53 2 times with a remainder of 11.
The next digit of our result is 2. 
Result so far: 3612442.0
Subtract 42 from 53 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 3612442.5
Subtracting 105 from 110 leaves us 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 10:
When dividing 50 by 21, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 3612442.52
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 11:
If we divide 80 by 21, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 3612442.523
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 12:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 3612442.5238
If we subtract 168 from 170, 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.

Going ahead to step 13:
When dividing 20 by 21, we get 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 3612442.5238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 14:
200 divided by 21 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 3612442.523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 15:
110 divided by 21 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 3612442.5238095
Subtracting 105 from 110 leaves us 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 16:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 3612442.52380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 3612442.52380952 with a remainder of 8e-09.