$ f(x) = \begin{cases} 3x - 8 & \text{if } x \leq 5 \\ 2k & \text{if } x > 5 \end{cases} $ is continuous. Find $k$.

Question

$ \frac{2}{7} $

$ \frac{3}{7} $

$ \frac{4}{7} $

$ \frac{7}{2} $

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