20124 ÷ 84 
We want to divide 20124 by 84.

Advancing to step 1:
2 divided by 84 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 84

On to step 2:
84 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Bring next digit (1) of the dividend behind the 20 and repeat the process: 201 / 84

Moving on to step 3:
When dividing 201 by 84, we get 2 with a remainder of 33.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 168 from 201 leaves us with 33.
Bring next digit (2) of the dividend behind the 33 and repeat the process: 332 / 84

Let's proceed to step 4:
If we divide 332 by 84, we get 3 and a remainder of 80.
Use 3 as the next digit of our solution. 
Result so far: 23.0
If we subtract 252 from 332, we get 80.
Append the next digit (4) from the dividend to 80 and continue with: 804 / 84

On to step 5:
If we divide 804 by 84, we get 9 and a remainder of 48.
Use 9 as the next digit of our solution. 
Result so far: 239.0
If we take 756 away from 804, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 6:
84 can be fit into 480 5 times, resulting in a remainder of 60.
Record the quotient 5 as the next digit in the result. 
Result so far: 239.5
Subtract 420 from 480 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 7:
84 goes into 600 7 times with a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 239.57
If we subtract 588 from 600, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 8:
84 goes into 120 1 times with a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 239.571
Subtract 84 from 120 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 9:
The number 84 fits into 360 4 times, leaving a remainder of 24.
Use 4 as the next digit of our solution. 
Result so far: 239.5714
Deduct 336 from 360 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 10:
If we divide 240 by 84, we get 2 and a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 239.57142
Deduct 168 from 240 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 11:
84 can be fit into 720 8 times, resulting in a remainder of 48.
Put 8 as the next digit of the answer. 
Result so far: 239.571428
Subtract 672 from 720 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 12:
480 divided by 84 is 5 with a remainder of 60.
Write down 5 as next digit of the result. 
Result so far: 239.5714285
Subtracting 420 from 480 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 13:
600 divided by 84 is 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 239.57142857
If we take 588 away from 600, we end up 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.

In conclusion, the division gives 239.57142857 with a balance of 1.2e-08.