$\{$x$^2-5$x$+4\}/\{3$x$-12\}$

Determine where f is continuous.

$($Give your answer as an interval in the form $(^(**),**).$ Use the symbol oo for infinity, uu for combining intervals, and an appropriate

type of parenthesis $"(",")","[","]"$ depending on whether the interval is open or closed. Enter O$/$ if the interval is empty. Express

numbers in exact form. Use symbolic notation and fractions where needed.$)$