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D( x )
21*x^9*y^-6 = 0
21*x^9*y^-6 = 0
21*x^9*y^-6 = 0
21*x^9*y^-6 = 0 // : 21*y^-6
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(35*x^5*y^4)/(21*x^9*y^-6) = 0
5/3*x^-4*y^10 = 0 // : 5/3*y^10
x^-4 = 0
x należy do O
x belongs to the empty set
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