9=12x-9x

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Solution for 9=12x-9x equation: 



9=12x-9x

We move all terms to the left:

9-(12x-9x)=0

We add all the numbers together, and all the variables

-(+3x)+9=0

We get rid of parentheses

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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