Answer
$\{ e^3\}$
Work Step by Step
$3ln\ x=9 \longrightarrow ln\ x=3 \longrightarrow x=e^3$ or $\{ e^3\}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.