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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(e^-100)/x = 2/3 // - 2/3
(e^-100)/x-(2/3) = 0
(e^-100)/x-2/3 = 0
-2/3 = 0
x belongs to the empty set
x belongs to the empty set
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