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-(r-3)=3+6r
We move all terms to the left:
-(r-3)-(3+6r)=0
We add all the numbers together, and all the variables
-(r-3)-(6r+3)=0
We get rid of parentheses
-r-6r+3-3=0
We add all the numbers together, and all the variables
-7r=0
r=0/-7
r=0
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