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