Answer: -7. *The answer must be have negative sign.*
Explanation:
First, do remove parenthesis first.

Then, add/subtract by the numbers.

A zero pair is when one positive integer tile is paired with one negative integer tile and the value is 0.
Example: (-1)+1=0
l6l=6
l-8l=8
7+(-7)=0
Opposites have the same absolute value.
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