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-8=-2(a+1)
We move all terms to the left:
-8-(-2(a+1))=0
We calculate terms in parentheses: -(-2(a+1)), so:We get rid of parentheses
-2(a+1)
We multiply parentheses
-2a-2
Back to the equation:
-(-2a-2)
2a+2-8=0
We add all the numbers together, and all the variables
2a-6=0
We move all terms containing a to the left, all other terms to the right
2a=6
a=6/2
a=3
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