Find all points of discontinuity of f, where f is defined by`f(x)={{:(|x|+3, ifxlt=-3),(-2x , if -3 < x <3),( 6x+2,ifxgeq3):}`

Explanation

To find all points of discontinuity of the function \( f(x) \) defined as:

\[
f(x) =
\begin{cases}
|x| + 3 & \text{if } x \leq -3 \\
-2x & \text{if } -3 < x < 3 \\
6x + 2 & \text{if } x \geq 3
...