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-1+7r=8r+8
We move all terms to the left:
-1+7r-(8r+8)=0
We get rid of parentheses
7r-8r-8-1=0
We add all the numbers together, and all the variables
-1r-9=0
We move all terms containing r to the left, all other terms to the right
-r=9
r=9/-1
r=-9
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