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-13=5r+8r
We move all terms to the left:
-13-(5r+8r)=0
We add all the numbers together, and all the variables
-(+13r)-13=0
We get rid of parentheses
-13r-13=0
We move all terms containing r to the left, all other terms to the right
-13r=13
r=13/-13
r=-1
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