Answer
$\frac{1}{3}; x \ne 3;$
Work Step by Step
$\frac{\frac{x}{3}-1}{x-3} $
Taking LCD in numerator,
$\frac{\frac{x}{3}-1}{x-3} = \frac{\frac{x-3}{3}}{x-3} ; x \ne 3; $
$= \frac{x-3}{3} \times \frac{1}{x-3} ; x \ne 3; $
$=\frac{1}{3}; x \ne 3;$
