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-(r-6)=3r+30
We move all terms to the left:
-(r-6)-(3r+30)=0
We get rid of parentheses
-r-3r+6-30=0
We add all the numbers together, and all the variables
-4r-24=0
We move all terms containing r to the left, all other terms to the right
-4r=24
r=24/-4
r=-6
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