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3r-10=r-10+2r
We move all terms to the left:
3r-10-(r-10+2r)=0
We add all the numbers together, and all the variables
3r-(3r-10)-10=0
We get rid of parentheses
3r-3r+10-10=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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