12-2x=x-9

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Solution for 12-2x=x-9 equation: 



12-2x=x-9

We move all terms to the left:

12-2x-(x-9)=0

We get rid of parentheses

-2x-x+9+12=0

We add all the numbers together, and all the variables

-3x+21=0

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

-3x=-21

x=-21/-3

x=+7

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