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-8(1-2r)=88
We move all terms to the left:
-8(1-2r)-(88)=0
We add all the numbers together, and all the variables
-8(-2r+1)-88=0
We multiply parentheses
16r-8-88=0
We add all the numbers together, and all the variables
16r-96=0
We move all terms containing r to the left, all other terms to the right
16r=96
r=96/16
r=6
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