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-8(7+r)=-8(-1-r)
We move all terms to the left:
-8(7+r)-(-8(-1-r))=0
We add all the numbers together, and all the variables
-8(r+7)-(-8(-1r-1))=0
We multiply parentheses
-8r-(-8(-1r-1))-56=0
We calculate terms in parentheses: -(-8(-1r-1)), so:We get rid of parentheses
-8(-1r-1)
We multiply parentheses
8r+8
Back to the equation:
-(8r+8)
-8r-8r-8-56=0
We add all the numbers together, and all the variables
-16r-64=0
We move all terms containing r to the left, all other terms to the right
-16r=64
r=64/-16
r=-4
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