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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-2*((125*x^4*y^3)/27)*y^6)^1)/3 = 0
(x^-2*((125*x^4*y^3)/27)*y^6)/3 = 0
125/81*x^2*y^9 = 0 // : 125/81*y^9
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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