x+9-2x=12

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



x+9-2x=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-3=0

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

-x=3

x=3/-1

x=-3

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