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D( x )
x <= 0
ln(x) = 0
x <= 0
ln(x) = 0
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x in (0:1) U (1:+oo)
(3*x)/ln(x) = 0
(3*x)/ln(x) = 0 // * ln(x)
3*x = 0
3*x = 0 // : 3
x = 0
x in { 0}
x belongs to the empty set
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