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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^4*((-2*6*x^-3*x^5*y^-1*y^3)/4)*y = 0
-3*x^6*y^3 = 0 // : -3*y^3
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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