12=-x-9

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Solution for 12=-x-9 equation: 



12=-x-9

We move all terms to the left:

12-(-x-9)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1x+9+12=0

We add all the numbers together, and all the variables

x+21=0

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

x=-21

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