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-13+11r-14=17r+15
We move all terms to the left:
-13+11r-14-(17r+15)=0
We add all the numbers together, and all the variables
11r-(17r+15)-27=0
We get rid of parentheses
11r-17r-15-27=0
We add all the numbers together, and all the variables
-6r-42=0
We move all terms containing r to the left, all other terms to the right
-6r=42
r=42/-6
r=-7
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