List of top Mathematics Questions on Continuity of a function asked in AP EAMCET

If a real-valued function $$ f(x) = \begin{cases} \frac{2x^2 + k(2x) + 9}{3x^2 - 7x - 6}, & \text{for } x \neq 3, \\ l, & \text{for } x = 3 \end{cases} $$ is continuous at \( x = 3 \) and \( l \) is a finite value, then \( l - k = \):