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-(+4x)-9=0

We get rid of parentheses

3x-4x-9=0

We add all the numbers together, and all the variables

-1x-9=0

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

-x=9

x=9/-1

x=-9

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