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-2(8r+2)=124
We move all terms to the left:
-2(8r+2)-(124)=0
We multiply parentheses
-16r-4-124=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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