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9r=3r-36
We move all terms to the left:
9r-(3r-36)=0
We get rid of parentheses
9r-3r+36=0
We add all the numbers together, and all the variables
6r+36=0
We move all terms containing r to the left, all other terms to the right
6r=-36
r=-36/6
r=-6
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