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-5(r+8)=-72r=
We move all terms to the left:
-5(r+8)-(-72r)=0
We multiply parentheses
-5r-(-72r)-40=0
We get rid of parentheses
-5r+72r-40=0
We add all the numbers together, and all the variables
67r-40=0
We move all terms containing r to the left, all other terms to the right
67r=40
r=40/67
r=40/67
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