X-4;x=12

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Solution for X-4;x=12 equation: 



X-4X=12

We move all terms to the left:

X-4X-(12)=0

We add all the numbers together, and all the variables

-3X-12=0

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

-3X=12

X=12/-3

X=-4

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