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D( x )
x = 0
x^5*y = 0
x^-28 = 0
x = 0
x = 0
x^5*y = 0
x^5*y = 0
x^5*y = 0 // : y
x^5 = 0
x = 0
x^-28 = 0
x^-28 = 0
1*x^-28 = 0 // : 1
x^-28 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(((x^5*y)^-8)/(x^-28))*y^5 = 0
x^-12*y^-3 = 0 // : y^-3
x^-12 = 0
x naleu017Cy do O
x belongs to the empty set
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