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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = 5/2 // - 5/2
ln(x)-(5/2) = 0
ln(x)-5/2 = 0
ln(x)-5/2 = 0 // + 5/2
ln(x) = 5/2
ln(x) = ln(e^(5/2))
x = e^(5/2)
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