-4=-x+3x

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Solution for -4=-x+3x equation: 



-4=-x+3x

We move all terms to the left:

-4-(-x+3x)=0

We add all the numbers together, and all the variables

-(+2x)-4=0

We get rid of parentheses

-2x-4=0

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

-2x=4

x=4/-2

x=-2

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