-12=6x+18+9x

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Solution for -12=6x+18+9x equation: 



-12=6x+18+9x

We move all terms to the left:

-12-(6x+18+9x)=0

We add all the numbers together, and all the variables

-(15x+18)-12=0

We get rid of parentheses

-15x-18-12=0

We add all the numbers together, and all the variables

-15x-30=0

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

-15x=30

x=30/-15

x=-2

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