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r/3-13=15
We move all terms to the left:
r/3-13-(15)=0
We add all the numbers together, and all the variables
r/3-28=0
We multiply all the terms by the denominator
r-28*3=0
We add all the numbers together, and all the variables
r-84=0
We move all terms containing r to the left, all other terms to the right
r=84
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