We're dividing 135978 by 20 
We want to divide 135978 by 20.

Moving on to step 1:
1 divided by 20 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 20

Let's proceed to step 2:
When dividing 13 by 20, we get 0 with a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 13 leaves us with 13.
Fetch the next digit (5) from the dividend, attach it to 13 and continue: 135 / 20

Going ahead to step 3:
20 goes into 135 6 times with a remainder of 15.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 120 from 135, we get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 20

On to step 4:
If we divide 159 by 20, we get 7 and a remainder of 19.
Use 7 as the next digit of our solution. 
Result so far: 67.0
Subtract 140 from 159 to get 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 20

Advancing to step 5:
The number 20 fits into 197 9 times, leaving a remainder of 17.
Record the quotient 9 as the next digit in the result. 
Result so far: 679.0
Subtract 180 from 197 to get 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 20

On to step 6:
If we divide 178 by 20, we get 8 and a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 6798.0
Subtracting 160 from 178 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
20 goes into 180 9 times with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 6798.9
The remainder is 0 after subtracting 180 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6798.9
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 6798.9
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 6798.9, with a leftover of 0.0.