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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/25)*x^(-9/15) = 0
4/25*x^(-3/5) = 0 // : 4/25
x^(-3/5) = 0
x naleu017Cy do O
x belongs to the empty set
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