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