x-9=3(x+9)

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



x-9=3(x+9)

We move all terms to the left:

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



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

3(x+9)

We multiply parentheses

3x+27

Back to the equation:

-(3x+27)



We get rid of parentheses

x-3x-27-9=0

We add all the numbers together, and all the variables

-2x-36=0

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

-2x=36

x=36/-2

x=-18

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