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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = -1/5 // + -1/5
ln(x)-(-1/5) = 0
ln(x)+1/5 = 0
ln(x)+1/5 = 0 // - 1/5
ln(x) = -1/5
ln(x) = ln(e^(-1/5))
x = e^(-1/5)
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