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D( x )
((-4*x^5)/5)*y^-3 = 0
((-4*x^5)/5)*y^-3 = 0
((-4*x^5)/5)*y^-3 = 0
-4/5*x^5*y^-3 = 0 // : -4/5*y^-3
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((-4*x^5)/5)*y^-3)^-1 = 0
-5/4*x^-5*y^3 = 0 // : -5/4*y^3
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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