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5+r/2=15
We move all terms to the left:
5+r/2-(15)=0
We add all the numbers together, and all the variables
r/2-10=0
We multiply all the terms by the denominator
r-10*2=0
We add all the numbers together, and all the variables
r-20=0
We move all terms containing r to the left, all other terms to the right
r=20
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