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D( x )
x <= 0
x <= 0
x in (0:+oo)
2/3 = 2*ln(x) // - 2*ln(x)
2/3-(2*ln(x)) = 0
2/3-2*ln(x) = 0
2/3-2*ln(x) = 0 // - 2/3
-2*ln(x) = -2/3 // : -2
ln(x) = -2/3/(-2)
ln(x) = 1/3
ln(x) = ln(e^(1/3))
x = e^(1/3)
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