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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = -1/9 // + -1/9
ln(x)-(-1/9) = 0
ln(x)+1/9 = 0
ln(x)+1/9 = 0 // - 1/9
ln(x) = -1/9
ln(x) = ln(e^(-1/9))
x = e^(-1/9)
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