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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = 15/29 // - 15/29
ln(x)-(15/29) = 0
ln(x)-15/29 = 0
ln(x)-15/29 = 0 // + 15/29
ln(x) = 15/29
ln(x) = ln(e^(15/29))
x = e^(15/29)
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