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D( x )
x^-6 = 0
x = 0
x^-6 = 0
x^-6 = 0
1*x^-6 = 0 // : 1
x^-6 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X^-9)/(x^-6) = 0
X^-9*x^6 = 0 // : X^-9
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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