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-9+6r=8r-7
We move all terms to the left:
-9+6r-(8r-7)=0
We get rid of parentheses
6r-8r+7-9=0
We add all the numbers together, and all the variables
-2r-2=0
We move all terms containing r to the left, all other terms to the right
-2r=2
r=2/-2
r=-1
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