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72=12+3r
We move all terms to the left:
72-(12+3r)=0
We add all the numbers together, and all the variables
-(3r+12)+72=0
We get rid of parentheses
-3r-12+72=0
We add all the numbers together, and all the variables
-3r+60=0
We move all terms containing r to the left, all other terms to the right
-3r=-60
r=-60/-3
r=+20
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