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96=-8(2r+4)
We move all terms to the left:
96-(-8(2r+4))=0
We calculate terms in parentheses: -(-8(2r+4)), so:We get rid of parentheses
-8(2r+4)
We multiply parentheses
-16r-32
Back to the equation:
-(-16r-32)
16r+32+96=0
We add all the numbers together, and all the variables
16r+128=0
We move all terms containing r to the left, all other terms to the right
16r=-128
r=-128/16
r=-8
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