4x-9=12x+12-x

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Solution for 4x-9=12x+12-x equation: 



4x-9=12x+12-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-(11x+12)-9=0

We get rid of parentheses

4x-11x-12-9=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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