12=-3(-5x-9)

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Solution for 12=-3(-5x-9) equation: 



12=-3(-5x-9)

We move all terms to the left:

12-(-3(-5x-9))=0



We calculate terms in parentheses: -(-3(-5x-9)), so:

-3(-5x-9)

We multiply parentheses

15x+27

Back to the equation:

-(15x+27)



We get rid of parentheses

-15x-27+12=0

We add all the numbers together, and all the variables

-15x-15=0

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

-15x=15

x=15/-15

x=-1

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