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-4(-2r-6)=88
We move all terms to the left:
-4(-2r-6)-(88)=0
We multiply parentheses
8r+24-88=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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