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48r-9=9(5r+2)
We move all terms to the left:
48r-9-(9(5r+2))=0
We calculate terms in parentheses: -(9(5r+2)), so:We get rid of parentheses
9(5r+2)
We multiply parentheses
45r+18
Back to the equation:
-(45r+18)
48r-45r-18-9=0
We add all the numbers together, and all the variables
3r-27=0
We move all terms containing r to the left, all other terms to the right
3r=27
r=27/3
r=9
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