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D( x )
((5*x^-2)/6)*y^-2 = 0
x = 0
((5*x^-2)/6)*y^-2 = 0
((5*x^-2)/6)*y^-2 = 0
5/6*x^-2*y^-2 = 0 // : 5/6*y^-2
x^-2 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((5*x^-2)/6)*y^-2)^-3 = 0
216/125*x^6*y^6 = 0 // : 216/125*y^6
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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