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D( x )
x^3 = 0
x = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4*y^4*(((2*x^3*z^2)^3)/(x^3))*z^2*z^3 = 0
8*x^2*y^4*z^11 = 0 // : 8*y^4*z^11
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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