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16+r/2=5
We move all terms to the left:
16+r/2-(5)=0
We add all the numbers together, and all the variables
r/2+11=0
We multiply all the terms by the denominator
r+11*2=0
We add all the numbers together, and all the variables
r+22=0
We move all terms containing r to the left, all other terms to the right
r=-22
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