3x=(9x+12)

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Solution for 3x=(9x+12) equation: 



3x=(9x+12)

We move all terms to the left:

3x-((9x+12))=0



We calculate terms in parentheses: -((9x+12)), so:

(9x+12)

We get rid of parentheses

9x+12

Back to the equation:

-(9x+12)



We get rid of parentheses

3x-9x-12=0

We add all the numbers together, and all the variables

-6x-12=0

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

-6x=12

x=12/-6

x=-2

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