-12x-21=9x

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Solution for -12x-21=9x equation: 



-12x-21=9x

We move all terms to the left:

-12x-21-(9x)=0

We add all the numbers together, and all the variables

-21x-21=0

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

-21x=21

x=21/-21

x=-1

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