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r/2-1=-1/2
We move all terms to the left:
r/2-1-(-1/2)=0
We get rid of parentheses
r/2-1+1/2=0
We multiply all the terms by the denominator
r+1-1*2=0
We add all the numbers together, and all the variables
r-1=0
We move all terms containing r to the left, all other terms to the right
r=1
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