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r/3=13/3
We move all terms to the left:
r/3-(13/3)=0
We add all the numbers together, and all the variables
r/3-(+13/3)=0
We get rid of parentheses
r/3-13/3=0
We multiply all the terms by the denominator
r-13=0
We move all terms containing r to the left, all other terms to the right
r=13
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