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