-12=x+x+x

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Solution for -12=x+x+x equation: 



-12=x+x+x

We move all terms to the left:

-12-(x+x+x)=0

We add all the numbers together, and all the variables

-(+3x)-12=0

We get rid of parentheses

-3x-12=0

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

-3x=12

x=12/-3

x=-4

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