X-3-9x=21

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Solution for X-3-9x=21 equation: 



X-3-9X=21

We move all terms to the left:

X-3-9X-(21)=0

We add all the numbers together, and all the variables

-8X-24=0

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

-8X=24

X=24/-8

X=-3

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