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16=r/3+12
We move all terms to the left:
16-(r/3+12)=0
We get rid of parentheses
-r/3-12+16=0
We multiply all the terms by the denominator
-r-12*3+16*3=0
We add all the numbers together, and all the variables
-1r+12=0
We move all terms containing r to the left, all other terms to the right
-r=-12
r=-12/-1
r=+12
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