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-2r+15=4r+39
We move all terms to the left:
-2r+15-(4r+39)=0
We get rid of parentheses
-2r-4r-39+15=0
We add all the numbers together, and all the variables
-6r-24=0
We move all terms containing r to the left, all other terms to the right
-6r=24
r=24/-6
r=-4
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