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D( x )
35*x^8*y^-3 = 0
35*x^8*y^-3 = 0
35*x^8*y^-3 = 0
35*x^8*y^-3 = 0 // : 35*y^-3
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(14*x^5*y^6)/(35*x^8*y^-3) = 0
2/5*x^-3*y^9 = 0 // : 2/5*y^9
x^-3 = 0
x naleu017Cy do O
x belongs to the empty set
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