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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = -5/6 // + -5/6
ln(x)-(-5/6) = 0
ln(x)+5/6 = 0
ln(x)+5/6 = 0 // - 5/6
ln(x) = -5/6
ln(x) = ln(e^(-5/6))
x = e^(-5/6)
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