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D( x )
x = 0
((5*x^-7)/6)*y^-7 = 0
x = 0
x = 0
((5*x^-7)/6)*y^-7 = 0
((5*x^-7)/6)*y^-7 = 0
5/6*x^-7*y^-7 = 0 // : 5/6*y^-7
x^-7 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((5*x^-7)/6)*y^-7)^-2 = 0
36/25*x^14*y^14 = 0 // : 36/25*y^14
x^14 = 0
x = 0
x in { 0}
x belongs to the empty set
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