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-2=r/3
We move all terms to the left:
-2-(r/3)=0
We add all the numbers together, and all the variables
-(+r/3)-2=0
We get rid of parentheses
-r/3-2=0
We multiply all the terms by the denominator
-r-2*3=0
We add all the numbers together, and all the variables
-1r-6=0
We move all terms containing r to the left, all other terms to the right
-r=6
r=6/-1
r=-6
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