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.-3(4r-8)=-36
We move all terms to the left:
.-3(4r-8)-(-36)=0
We add all the numbers together, and all the variables
-3(4r-8)=0
We multiply parentheses
-12r+24=0
We move all terms containing r to the left, all other terms to the right
-12r=-24
r=-24/-12
r=+2
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