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24=3(3r-7)
We move all terms to the left:
24-(3(3r-7))=0
We calculate terms in parentheses: -(3(3r-7)), so:We get rid of parentheses
3(3r-7)
We multiply parentheses
9r-21
Back to the equation:
-(9r-21)
-9r+21+24=0
We add all the numbers together, and all the variables
-9r+45=0
We move all terms containing r to the left, all other terms to the right
-9r=-45
r=-45/-9
r=+5
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