-12=6+3-x

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Solution for -12=6+3-x equation: 



-12=6+3-x

We move all terms to the left:

-12-(6+3-x)=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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