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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x-(x+11)+3=0

We get rid of parentheses

-2x-x-11+3=0

We add all the numbers together, and all the variables

-3x-8=0

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

-3x=8

x=8/-3

x=-2+2/3

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