72=12+3r

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Solution for 72=12+3r equation: 



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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