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D( x )
14*x^6*y^3 = 0
x = 0
14*x^6*y^3 = 0
14*x^6*y^3 = 0
14*x^6*y^3 = 0 // : 14*y^3
x^6 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^-5*y^-7)/(14*x^6*y^3) = 0
1/7*x^-11*y^-10 = 0 // : 1/7*y^-10
x^-11 = 0
x należy do O
x belongs to the empty set
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