note that if a number x, is inbetween: |x|, then x will always be positive afterwards.
|6 - 6z|
z = 4
Plug in 4 for z
|6 - 6(4)|
|6 - 24|
Simplify:
|6 - 24|
|- 18| = 18
Note that the question now look like:
17 - (18)
Subtract.
17 - 18 = -1
-1 is your answer
hope this helps