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-3r+31=2r+32
We move all terms to the left:
-3r+31-(2r+32)=0
We get rid of parentheses
-3r-2r-32+31=0
We add all the numbers together, and all the variables
-5r-1=0
We move all terms containing r to the left, all other terms to the right
-5r=1
r=1/-5
r=-1/5
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