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D( x )
x <= 0
x = 0
x <= 0
x = 0
x = 0
x in (0:+oo)
(ln(x)-2)/x = 0
(ln(x)-2)/x = 0 // * x
ln(x)-2 = 0
ln(x)-2 = 0 // + 2
ln(x) = 2
ln(x) = ln(e^2)
x = e^2
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