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