-12=-x-3x

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Solution for -12=-x-3x equation: 



-12=-x-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-4x)-12=0

We get rid of parentheses

4x-12=0

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

4x=12

x=12/4

x=3

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