158986 ÷ 20 
We want to divide 158986 by 20.

Advancing to step 1:
If we divide 1 by 20, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 20

Let's proceed to step 2:
When dividing 15 by 20, we get 0 with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 20

Step 3:
158 divided by 20 is 7 with a remainder of 18.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 140 from 158 to get 18.
Bring next digit (9) of the dividend behind the 18 and repeat the process: 189 / 20

Let's proceed to step 4:
When dividing 189 by 20, we get 9 with a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 79.0
If we take 180 away from 189, we end up with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 20

On to step 5:
If we divide 98 by 20, we get 4 and a remainder of 18.
The next digit of our result is 4. 
Result so far: 794.0
Subtracting 80 from 98 leaves us with 18.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 20

Going ahead to step 6:
20 can be fit into 186 9 times, resulting in a remainder of 6.
The next digit of our result is 9. 
Result so far: 7949.0
Subtract 180 from 186 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
60 divided by 20 is 3 with a remainder of 0.
The next digit of our result is 3. 
Result so far: 7949.3
Subtracting 60 from 60 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7949.3
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.

Moving on to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7949.3
Deduct 0 from 0 and we're left with 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 7949.3, with a leftover of 0.0.