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D( x )
x^-5*x^9*y^-5 = 0
x = 0
x^-5*x^9*y^-5 = 0
x^-5*x^9*y^-5 = 0
x^4*y^-5 = 0 // : y^-5
x^4 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-5*x^9*y^-5)^-1)/2 = 0
1/2*x^-4*y^5 = 0 // : 1/2*y^5
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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