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(6r+3)(3)=
We move all terms to the left:
(6r+3)(3)-()=0
We add all the numbers together, and all the variables
(6r+3)3=0
We multiply parentheses
18r+9=0
We move all terms containing r to the left, all other terms to the right
18r=-9
r=-9/18
r=-1/2
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