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-15=6r-5r
We move all terms to the left:
-15-(6r-5r)=0
We add all the numbers together, and all the variables
-(+r)-15=0
We get rid of parentheses
-r-15=0
We add all the numbers together, and all the variables
-1r-15=0
We move all terms containing r to the left, all other terms to the right
-r=15
r=15/-1
r=-15
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