Find all the points of discontinuity of \( f \), where \( f \) is d...

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Find all the points of discontinuity of \( f \), where \( f \) is defined by \( f(x)=\left\{\begin{array}{l}3 x+5, \text { if } x \leq 5 \\ 3 x-5, \text { if } x5\end{array}\right. \)
\( \mathrm{P} \)
W
(1) \( x=5 \)
(2) \( x=-5 \)
(3) \( x \in R \)
(4) \( x \in R^{+} \)
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