8217126 ÷ 390 
Our goal is to divide 8217126 by 390.

Let's proceed to step 1:
When dividing 8 by 390, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 390

Going ahead to step 2:
When dividing 82 by 390, we get 0 with a remainder of 82.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 82 leaves us with 82.
Include the next digit (1) from the dividend after 82, then repeat: 821 / 390

Moving on to step 3:
390 goes into 821 2 times with a remainder of 41.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 41 after subtracting 780 from 821.
Fetch the next digit (7) from the dividend, attach it to 41 and continue: 417 / 390

Step 4:
390 can be fit into 417 1 times, resulting in a remainder of 27.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we take 390 away from 417, we end up with 27.
Append the next digit (1) from the dividend to 27 and continue with: 271 / 390

Going ahead to step 5:
271 divided by 390 is 0 with a remainder of 271.
Put 0 as the next digit of the answer. 
Result so far: 210.0
Subtract 0 from 271 to get 271.
Fetch the next digit (2) from the dividend, attach it to 271 and continue: 2712 / 390

Let's proceed to step 6:
2712 divided by 390 is 6 with a remainder of 372.
Record the quotient 6 as the next digit in the result. 
Result so far: 2106.0
Subtract 2340 from 2712 to get 372.
Fetch the next digit (6) from the dividend, attach it to 372 and continue: 3726 / 390

Advancing to step 7:
If we divide 3726 by 390, we get 9 and a remainder of 216.
Write down 9 as next digit of the result. 
Result so far: 21069.0
If we take 3510 away from 3726, we end up with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Let's proceed to step 8:
When dividing 2160 by 390, we get 5 with a remainder of 210.
The number 5 becomes the next digit in our result. 
Result so far: 21069.5
Subtract 1950 from 2160 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Advancing to step 9:
If we divide 2100 by 390, we get 5 and a remainder of 150.
The next digit of our result is 5. 
Result so far: 21069.55
If we take 1950 away from 2100, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

The final outcome is 21069.55, with a leftover of 0.15.