Find the value of a and b such that the following function f(x) is a continuous functions : $ f(x) = \left\{ \begin{array}{l l}5, & \quad { x \leq 2} \\ ax+b, & \quad { 2 < x < 10} \\ 21, & \quad { x \geq 10 } \end{array} \right. $

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