12-x=9+2x

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



12-x=9+2x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(2x+9)+12=0

We get rid of parentheses

-1x-2x-9+12=0

We add all the numbers together, and all the variables

-3x+3=0

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

-3x=-3

x=-3/-3

x=1

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