12=3(r+6)

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Solution for 12=3(r+6) equation: 



12=3(r+6)

We move all terms to the left:

12-(3(r+6))=0



We calculate terms in parentheses: -(3(r+6)), so:

3(r+6)

We multiply parentheses

3r+18

Back to the equation:

-(3r+18)



We get rid of parentheses

-3r-18+12=0

We add all the numbers together, and all the variables

-3r-6=0

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

-3r=6

r=6/-3

r=-2

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