-9=3x-x

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Solution for -9=3x-x equation: 



-9=3x-x

We move all terms to the left:

-9-(3x-x)=0

We add all the numbers together, and all the variables

-(+2x)-9=0

We get rid of parentheses

-2x-9=0

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

-2x=9

x=9/-2

x=-4+1/2

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