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-(6r+3)=r
We move all terms to the left:
-(6r+3)-(r)=0
We add all the numbers together, and all the variables
-1r-(6r+3)=0
We get rid of parentheses
-1r-6r-3=0
We add all the numbers together, and all the variables
-7r-3=0
We move all terms containing r to the left, all other terms to the right
-7r=3
r=3/-7
r=-3/7
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