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3(8+7r)=3(-8+6r)
We move all terms to the left:
3(8+7r)-(3(-8+6r))=0
We add all the numbers together, and all the variables
3(7r+8)-(3(6r-8))=0
We multiply parentheses
21r-(3(6r-8))+24=0
We calculate terms in parentheses: -(3(6r-8)), so:We get rid of parentheses
3(6r-8)
We multiply parentheses
18r-24
Back to the equation:
-(18r-24)
21r-18r+24+24=0
We add all the numbers together, and all the variables
3r+48=0
We move all terms containing r to the left, all other terms to the right
3r=-48
r=-48/3
r=-16
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