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(r+3)/3=6
We move all terms to the left:
(r+3)/3-(6)=0
We multiply all the terms by the denominator
(r+3)-6*3=0
We add all the numbers together, and all the variables
(r+3)-18=0
We get rid of parentheses
r+3-18=0
We add all the numbers together, and all the variables
r-15=0
We move all terms containing r to the left, all other terms to the right
r=15
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