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-2r=3r+10
We move all terms to the left:
-2r-(3r+10)=0
We get rid of parentheses
-2r-3r-10=0
We add all the numbers together, and all the variables
-5r-10=0
We move all terms containing r to the left, all other terms to the right
-5r=10
r=10/-5
r=-2
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