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27=5r-8
We move all terms to the left:
27-(5r-8)=0
We get rid of parentheses
-5r+8+27=0
We add all the numbers together, and all the variables
-5r+35=0
We move all terms containing r to the left, all other terms to the right
-5r=-35
r=-35/-5
r=+7
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