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D( x )
x^5 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((-x)^4*y)^3*((5*y^6)/(x^5)) = 0
5*x^7*y^9 = 0 // : 5*y^9
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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