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4(2r-8)=88
We move all terms to the left:
4(2r-8)-(88)=0
We multiply parentheses
8r-32-88=0
We add all the numbers together, and all the variables
8r-120=0
We move all terms containing r to the left, all other terms to the right
8r=120
r=120/8
r=15
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