If $f(x) = \left\{ \begin{array} {1 1} 1 & \quad, \text{ if $ x \leq$ 3 }\\ ax+b & \quad, \text{if $3 < x < 5$ } \\ 7 & \quad, \text{ if $ 5 \leq x $ } \end{array} \right.$ Determine the values if a and b so that $f(x)$ is continuous?

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