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