27=12x-9x

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Solution for 27=12x-9x equation: 



27=12x-9x

We move all terms to the left:

27-(12x-9x)=0

We add all the numbers together, and all the variables

-(+3x)+27=0

We get rid of parentheses

-3x+27=0

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

-3x=-27

x=-27/-3

x=+9

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