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