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r/3+5=9
We move all terms to the left:
r/3+5-(9)=0
We add all the numbers together, and all the variables
r/3-4=0
We multiply all the terms by the denominator
r-4*3=0
We add all the numbers together, and all the variables
r-12=0
We move all terms containing r to the left, all other terms to the right
r=12
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