3 ln x - ln 3 = 3

First, we'll impose the constraint of existence of
logarithms:

x>0

Now,
we'll use the power property of logarithms, so that:

3 ln x
= ln x^3

We'll re-write the
equation:

 ln x^3  - ln 3 =
3

Since the bases of logarithms are matching, we'll use the
quotient rule:

ln (x^3/3) =
3

We'll have:

x^3/3 =
e^3

x^3 = 3e^3

x
= e*[(3)^1/3]

Since the
solution is positive, it is valid.