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

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



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

We move all terms to the left:

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



We calculate terms in parentheses: -((3x+9)-(3x-9)), so:

(3x+9)-(3x-9)

We get rid of parentheses

3x-3x+9+9

We add all the numbers together, and all the variables

18

Back to the equation:

-(18)



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

x=18

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