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-2+3r=5r+2
We move all terms to the left:
-2+3r-(5r+2)=0
We get rid of parentheses
3r-5r-2-2=0
We add all the numbers together, and all the variables
-2r-4=0
We move all terms containing r to the left, all other terms to the right
-2r=4
r=4/-2
r=-2
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