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2=-r/2+5
We move all terms to the left:
2-(-r/2+5)=0
We get rid of parentheses
r/2-5+2=0
We multiply all the terms by the denominator
r-5*2+2*2=0
We add all the numbers together, and all the variables
r-6=0
We move all terms containing r to the left, all other terms to the right
r=6
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