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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = -3/4 // + -3/4
ln(x)-(-3/4) = 0
ln(x)+3/4 = 0
ln(x)+3/4 = 0 // - 3/4
ln(x) = -3/4
ln(x) = ln(e^(-3/4))
x = e^(-3/4)
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