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D( x )
x = 0
x^-5 = 0
x = 0
x = 0
x^-5 = 0
x^-5 = 0
1*x^-5 = 0 // : 1
x^-5 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(((x^2*y^-2)^5)/(x^-5))*y^4 = 0
x^15*y^-6 = 0 // : y^-6
x^15 = 0
x = 0
x in { 0}
x belongs to the empty set
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