-12=(3x-9)+15

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Solution for -12=(3x-9)+15 equation: 



-12=(3x-9)+15

We move all terms to the left:

-12-((3x-9)+15)=0



We calculate terms in parentheses: -((3x-9)+15), so:

(3x-9)+15

We get rid of parentheses

3x-9+15

We add all the numbers together, and all the variables

3x+6

Back to the equation:

-(3x+6)



We get rid of parentheses

-3x-6-12=0

We add all the numbers together, and all the variables

-3x-18=0

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

-3x=18

x=18/-3

x=-6

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