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D( x )
x = 0
2*x^-2 = 0
x = 0
x = 0
2*x^-2 = 0
2*x^-2 = 0
2*x^-2 = 0 // : 2
x^-2 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(4*x^-3)/(2*x^-2) = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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