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D( x )
8*x^2*y^2*z = 0
8*x^2*y^2*z = 0
8*x^2*y^2*z = 0
8*x^2*y^2*z = 0 // : 8*y^2*z
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(24*x^3*y^6*z^3)/(8*x^2*y^2*z) = 0
3*x*y^4*z^2 = 0 // : 3*y^4*z^2
x = 0
x in { 0}
x belongs to the empty set
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