84021512 divided by 390 
Let's see how many times 390 fits into 84021512.

Going ahead to step 1:
The number 390 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 390

Advancing to step 2:
When dividing 84 by 390, we get 0 with a remainder of 84.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 84 to get 84.
Append the next digit (0) from the dividend to 84 and continue with: 840 / 390

Moving on to step 3:
If we divide 840 by 390, we get 2 and a remainder of 60.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 780 from 840, we get 60.
Grab the next digit (2) from the dividend, add it to 60, then carry on: 602 / 390

Let's proceed to step 4:
If we divide 602 by 390, we get 1 and a remainder of 212.
Use 1 as the next digit of our solution. 
Result so far: 21.0
If we subtract 390 from 602, we get 212.
Grab the next digit (1) from the dividend, add it to 212, then carry on: 2121 / 390

Step 5:
2121 divided by 390 is 5 with a remainder of 171.
Use 5 as the next digit of our solution. 
Result so far: 215.0
The remainder is 171 after subtracting 1950 from 2121.
Take the next digit (5) from the dividend and append it to 171, then repeat: 1715 / 390

Moving on to step 6:
390 goes into 1715 4 times with a remainder of 155.
The number 4 becomes the next digit in our result. 
Result so far: 2154.0
If we take 1560 away from 1715, we end up with 155.
Take the next digit (1) from the dividend and append it to 155, then repeat: 1551 / 390

Let's proceed to step 7:
If we divide 1551 by 390, we get 3 and a remainder of 381.
Write down 3 as next digit of the result. 
Result so far: 21543.0
Deduct 1170 from 1551 and we're left with 381.
Bring next digit (2) of the dividend behind the 381 and repeat the process: 3812 / 390

On to step 8:
3812 divided by 390 is 9 with a remainder of 302.
Use 9 as the next digit of our solution. 
Result so far: 215439.0
Deduct 3510 from 3812 and we're left with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Moving on to step 9:
3020 divided by 390 is 7 with a remainder of 290.
Record the quotient 7 as the next digit in the result. 
Result so far: 215439.7
Subtracting 2730 from 3020 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Step 10:
390 goes into 2900 7 times with a remainder of 170.
The number 7 becomes the next digit in our result. 
Result so far: 215439.77
If we subtract 2730 from 2900, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

In conclusion, the division gives 215439.77 with a balance of 0.17.