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5(r-1)=3(r+7)
We move all terms to the left:
5(r-1)-(3(r+7))=0
We multiply parentheses
5r-(3(r+7))-5=0
We calculate terms in parentheses: -(3(r+7)), so:We get rid of parentheses
3(r+7)
We multiply parentheses
3r+21
Back to the equation:
-(3r+21)
5r-3r-21-5=0
We add all the numbers together, and all the variables
2r-26=0
We move all terms containing r to the left, all other terms to the right
2r=26
r=26/2
r=13
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