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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^-6)/(x^-5))*y^3 = 0
x^7*y^-3 = 0 // : y^-3
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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