I need help with this problem

We have,
[tex]\begin{gathered} e^{\ln x}=x \\ \log _ex=\ln x \end{gathered}[/tex]The given expression is,
[tex]\ln 5x=4[/tex]This can be written as,
[tex]\begin{gathered} \ln 5x=4 \\ \log _e5x=4 \\ e^4=5x \end{gathered}[/tex]