12=3(r-80)

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Solution for 12=3(r-80) equation: 



12=3(r-80)

We move all terms to the left:

12-(3(r-80))=0



We calculate terms in parentheses: -(3(r-80)), so:

3(r-80)

We multiply parentheses

3r-240

Back to the equation:

-(3r-240)



We get rid of parentheses

-3r+240+12=0

We add all the numbers together, and all the variables

-3r+252=0

We move all terms containing r to the left, all other terms to the right

-3r=-252

r=-252/-3

r=+84

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