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2(r-+3)=4(r-+10)
We move all terms to the left:
2(r-+3)-(4(r-+10))=0
We add all the numbers together, and all the variables
2(+r)-(4(+r))=0
We multiply parentheses
2r-(4(+r))=0
We calculate terms in parentheses: -(4(+r)), so:We add all the numbers together, and all the variables
4(+r)
We multiply parentheses
4r
Back to the equation:
-(4r)
-2r=0
r=0/-2
r=0
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