3x-9=-x+3x

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



3x-9=-x+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(+2x)-9=0

We get rid of parentheses

3x-2x-9=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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