-9=-12-x

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Solution for -9=-12-x equation: 



-9=-12-x

We move all terms to the left:

-9-(-12-x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1x+12-9=0

We add all the numbers together, and all the variables

x+3=0

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

x=-3

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