Answer
$x \approx 0.05$
Work Step by Step
RECALL:
$\ln{x}= y \longrightarrow e^y=x$
Use the rule above to obtain:
$e^{-3}=x
\\\dfrac{1}{e^3}=x$
Use a calculator to obtain:
$x=\dfrac{1}{e^3}
\\x=0.04978706837
\\x \approx 0.05$