factorise 27x cube +y cube+z cube - 9xyz
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3x^3+ y^3+z^3-9xyz= (3x+y+z)(3x^2+y^2+z^2-3x*y-y*z-z*3x)
(3x+y+z)(3x^2+y^2+z^2-3xy-yz-3xz)
(3x+y+z)(3x^2+y^2+z^2-3xy-yz-3xz)
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