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8(r-4)+5=-91
We move all terms to the left:
8(r-4)+5-(-91)=0
We add all the numbers together, and all the variables
8(r-4)+96=0
We multiply parentheses
8r-32+96=0
We add all the numbers together, and all the variables
8r+64=0
We move all terms containing r to the left, all other terms to the right
8r=-64
r=-64/8
r=-8
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