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D( x )
18*x^4*y^5 = 0
18*x^4*y^5 = 0
18*x^4*y^5 = 0
18*x^4*y^5 = 0 // : 18*y^5
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((-6*x^5*y^-2)^2)/(18*x^4*y^5) = 0
2*x^6*y^-9 = 0 // : 2*y^-9
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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