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D( x )
35*x^5*y^4 = 0
35*x^5*y^4 = 0
35*x^5*y^4 = 0
35*x^5*y^4 = 0 // : 35*y^4
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(25*x^3*y^20)/(35*x^5*y^4) = 0
5/7*x^-2*y^16 = 0 // : 5/7*y^16
x^-2 = 0
x należy do O
x belongs to the empty set
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