Answer :

[tex]\ln \frac{1}{x} +\ln2x^3=\ln3[/tex]
[tex]\ln \frac{2x^3}{x} = \ln3[/tex]
[tex]\ln2x^2=\ln3[/tex]
[tex]2x^2=3[/tex]
[tex]x=\sqrt{ \frac{3}{2} } [/tex]

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