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9(r-3)=3r
We move all terms to the left:
9(r-3)-(3r)=0
We add all the numbers together, and all the variables
-3r+9(r-3)=0
We multiply parentheses
-3r+9r-27=0
We add all the numbers together, and all the variables
6r-27=0
We move all terms containing r to the left, all other terms to the right
6r=27
r=27/6
r=4+1/2
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