Answer
$$x = 4$$
Work Step by Step
To find which numbers the rational expression will be undefined, we set the denominator equal to zero and then solve:
$$6x - 24 = 0$$
Add $24$ to both sides to isolate the variable to one side of the equation:
$$6x = 24$$
Divide by $6$ to solve for $x$:
$$x = 4$$
