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-6(-2+2r)=84
We move all terms to the left:
-6(-2+2r)-(84)=0
We add all the numbers together, and all the variables
-6(2r-2)-84=0
We multiply parentheses
-12r+12-84=0
We add all the numbers together, and all the variables
-12r-72=0
We move all terms containing r to the left, all other terms to the right
-12r=72
r=72/-12
r=-6
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