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r/13+4=9
We move all terms to the left:
r/13+4-(9)=0
We add all the numbers together, and all the variables
r/13-5=0
We multiply all the terms by the denominator
r-5*13=0
We add all the numbers together, and all the variables
r-65=0
We move all terms containing r to the left, all other terms to the right
r=65
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