12=3(r-11)

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Solution for 12=3(r-11) equation: 



12=3(r-11)

We move all terms to the left:

12-(3(r-11))=0



We calculate terms in parentheses: -(3(r-11)), so:

3(r-11)

We multiply parentheses

3r-33

Back to the equation:

-(3r-33)



We get rid of parentheses

-3r+33+12=0

We add all the numbers together, and all the variables

-3r+45=0

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

-3r=-45

r=-45/-3

r=+15

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