Answer
$-1$
Work Step by Step
$\because y=\log_a x \text{ is equivalent to } x= a^y$
$\therefore -1 = \log_3 3^x \text{ is equivalent to } 3^x=3^{-1}$
Solve the equation above using the rule $a^m=a^n\implies =n$ to obtain:
$$3^x=3^{-1}$$
$$x=-1$$
