|-12-(-8)|= simply expression

4

Step by step:
First, get rid of the parenthesis.
| -12 + 8 |
Then, add up the two numbers.
| -4 |
The absolute value of -4 equals 4 because it makes number become positive. So, the answer is 4.

Hope this helps! Please tell me if I did anything wrong, thank you and have a great day!!