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