12-(3x-9)=4x

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Solution for 12-(3x-9)=4x equation: 



12-(3x-9)=4x

We move all terms to the left:

12-(3x-9)-(4x)=0

We add all the numbers together, and all the variables

-4x-(3x-9)+12=0

We get rid of parentheses

-4x-3x+9+12=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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