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r/2=3/2
We move all terms to the left:
r/2-(3/2)=0
We add all the numbers together, and all the variables
r/2-(+3/2)=0
We get rid of parentheses
r/2-3/2=0
We multiply all the terms by the denominator
r-3=0
We move all terms containing r to the left, all other terms to the right
r=3
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