(-9)-x=12

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Solution for (-9)-x=12 equation: 



(-9)-x=12

We move all terms to the left:

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

determiningTheFunctionDomain
-x-12+(-9)=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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