X+12-4x=40

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Solution for X+12-4x=40 equation: 



X+12-4X=40

We move all terms to the left:

X+12-4X-(40)=0

We add all the numbers together, and all the variables

-3X-28=0

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

-3X=28

X=28/-3

X=-9+1/3

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