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r/2-1=8
We move all terms to the left:
r/2-1-(8)=0
We add all the numbers together, and all the variables
r/2-9=0
We multiply all the terms by the denominator
r-9*2=0
We add all the numbers together, and all the variables
r-18=0
We move all terms containing r to the left, all other terms to the right
r=18
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