Images X 3 4X

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X 3 4x. 3x-12-x=-x+2x-12. X^3-6x^2+12x-8. X+X/2=12. X*3-12=X*2.
3x-12-x=-x+2x-12. X^3-6x^2+12x-8. X+X/2=12. X*3-12=X*2.

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