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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4*y^-3*((24*x^5*y^-3*z)/12)*z^2 = 0
2*x*y^-6*z^3 = 0 // : 2*y^-6*z^3
x = 0
x in { 0}
x belongs to the empty set
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