18=3(3a-12)

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Solution for 18=3(3a-12) equation: 



18=3(3a-12)

We move all terms to the left:

18-(3(3a-12))=0



We calculate terms in parentheses: -(3(3a-12)), so:

3(3a-12)

We multiply parentheses

9a-36

Back to the equation:

-(9a-36)



We get rid of parentheses

-9a+36+18=0

We add all the numbers together, and all the variables

-9a+54=0

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

-9a=-54

a=-54/-9

a=+6

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