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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2/5)*x^-3)/5 = 0
2/25*x^-3 = 0 // : 2/25
x^-3 = 0
x naleu017Cy do O
x belongs to the empty set
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