Find the point (s) of discountinuity of the function 'f' given by $f(x) = \left\{ \begin{array}{l l}|x|+3, & \quad { x \leq -3} \\ -2x, & \quad {-3 < x < 3} \\ 6x+2, & \quad { x > 3 } \end{array} \right.$

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