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72=-r+7r
We move all terms to the left:
72-(-r+7r)=0
We add all the numbers together, and all the variables
-(+6r)+72=0
We get rid of parentheses
-6r+72=0
We move all terms containing r to the left, all other terms to the right
-6r=-72
r=-72/-6
r=+12
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