-18=3(3a+9)

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Solution for -18=3(3a+9) equation: 



-18=3(3a+9)

We move all terms to the left:

-18-(3(3a+9))=0



We calculate terms in parentheses: -(3(3a+9)), so:

3(3a+9)

We multiply parentheses

9a+27

Back to the equation:

-(9a+27)



We get rid of parentheses

-9a-27-18=0

We add all the numbers together, and all the variables

-9a-45=0

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

-9a=45

a=45/-9

a=-5

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