#### Answer

$-\frac{2}{5}$

#### Work Step by Step

When $x=-\frac{1}{3}$ and $z=\frac{5}{6}$:
$\frac{x}{z}$
$=\frac{(-\frac{1}{3})}{(\frac{5}{6})}$
$=(-\frac{1}{3})\div(\frac{5}{6})$
$=-(\frac{1}{3}\div\frac{5}{6})$
$=-(\frac{1}{3}\times\frac{6}{5})$
$=-(\frac{1}{1}\times\frac{2}{5})$
$=-\frac{2}{5}$