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-18-((2r-4)/(-3))=0
We multiply all the terms by the denominator
-((2r-4)-18*(-3))=0
We calculate terms in parentheses: -((2r-4)-18*(-3)), so:We get rid of parentheses
(2r-4)-18*(-3)
We add all the numbers together, and all the variables
(2r-4)+54
We get rid of parentheses
2r-4+54
We add all the numbers together, and all the variables
2r+50
Back to the equation:
-(2r+50)
-2r-50=0
We move all terms containing r to the left, all other terms to the right
-2r=50
r=50/-2
r=-25
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