-x=12.

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Solution for -x=12. equation: 



-x=12.

We move all terms to the left:

-x-(12.)=0

We add all the numbers together, and all the variables

-x-12=0

We add all the numbers together, and all the variables

-1x-12=0

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

-x=12

x=12/-1

x=-12

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