X+12=-9+2x

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



X+12=-9+2X

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

X-2X+9+12=0

We add all the numbers together, and all the variables

-1X+21=0

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

-X=-21

X=-21/-1

X=+21

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