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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-2*y^4*((12*x^6*y^-9*z^-3)/4) = 0
3*x^4*y^-5*z^-3 = 0 // : 3*y^-5*z^-3
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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