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16+r/2=-2
We move all terms to the left:
16+r/2-(-2)=0
We add all the numbers together, and all the variables
r/2+18=0
We multiply all the terms by the denominator
r+18*2=0
We add all the numbers together, and all the variables
r+36=0
We move all terms containing r to the left, all other terms to the right
r=-36
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