-9=-1+x+3x

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Solution for -9=-1+x+3x equation: 



-9=-1+x+3x

We move all terms to the left:

-9-(-1+x+3x)=0

We add all the numbers together, and all the variables

-(4x-1)-9=0

We get rid of parentheses

-4x+1-9=0

We add all the numbers together, and all the variables

-4x-8=0

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

-4x=8

x=8/-4

x=-2

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