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1+r/2=5
We move all terms to the left:
1+r/2-(5)=0
We add all the numbers together, and all the variables
r/2-4=0
We multiply all the terms by the denominator
r-4*2=0
We add all the numbers together, and all the variables
r-8=0
We move all terms containing r to the left, all other terms to the right
r=8
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