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6r+18=3r+54
We move all terms to the left:
6r+18-(3r+54)=0
We get rid of parentheses
6r-3r-54+18=0
We add all the numbers together, and all the variables
3r-36=0
We move all terms containing r to the left, all other terms to the right
3r=36
r=36/3
r=12
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