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1+r/15=9
We move all terms to the left:
1+r/15-(9)=0
We add all the numbers together, and all the variables
r/15-8=0
We multiply all the terms by the denominator
r-8*15=0
We add all the numbers together, and all the variables
r-120=0
We move all terms containing r to the left, all other terms to the right
r=120
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