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D( x )
4*x^-2 = 0
x^5 = 0
x = 0
4*x^-2 = 0
4*x^-2 = 0
4*x^-2 = 0 // : 4
x^-2 = 0
x naleu017Cy do O
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x^-2)^-2)/(x^5) = 0
1/16*x^-1 = 0 // : 1/16
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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