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5+r/2=11
We move all terms to the left:
5+r/2-(11)=0
We add all the numbers together, and all the variables
r/2-6=0
We multiply all the terms by the denominator
r-6*2=0
We add all the numbers together, and all the variables
r-12=0
We move all terms containing r to the left, all other terms to the right
r=12
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