x+3x=3x-9

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



x+3x=3x-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-(3x-9)=0

We get rid of parentheses

4x-3x+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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