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(2r+3)=(r+3)
We move all terms to the left:
(2r+3)-((r+3))=0
We get rid of parentheses
2r-((r+3))+3=0
We calculate terms in parentheses: -((r+3)), so:We get rid of parentheses
(r+3)
We get rid of parentheses
r+3
Back to the equation:
-(r+3)
2r-r-3+3=0
We add all the numbers together, and all the variables
r=0
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