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-15=2r+
We move all terms to the left:
-15-(2r+)=0
We add all the numbers together, and all the variables
-(+2r)-15=0
We get rid of parentheses
-2r-15=0
We move all terms containing r to the left, all other terms to the right
-2r=15
r=15/-2
r=-7+1/2
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