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