Answer:
8
Step-by-step explanation:
The minus sign outside parentheses changes the sign of what's inside parentheses when parentheses are eliminated:
7 -(-1) = 7 +1 = 8
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Alternate way to think about it
Subtraction is the same as addition of the opposite. The opposite of -1 is +1, so subtracting -1 is the same as adding +1.
