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-(r-8)=-18
We move all terms to the left:
-(r-8)-(-18)=0
We add all the numbers together, and all the variables
-(r-8)+18=0
We get rid of parentheses
-r+8+18=0
We add all the numbers together, and all the variables
-1r+26=0
We move all terms containing r to the left, all other terms to the right
-r=-26
r=-26/-1
r=+26
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