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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((-20/25)/x)/5 = 0
-4/25*x^-1 = 0 // : -4/25
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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