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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((-8/13)/x)/4 = 0
-2/13*x^-1 = 0 // : -2/13
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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