Question Number 121575 by oustmuchiya@gmail.com last updated on 09/Nov/20
Commented by Dwaipayan Shikari last updated on 09/Nov/20
$${R}−\left\{\mathrm{7},−\mathrm{7}\right\} \\ $$
Answered by TANMAY PANACEA last updated on 09/Nov/20
$${at}\:{x}=\mathrm{7}\:\:{and}\:−\mathrm{7}\:\:{the}\:{function}\:{discontinous} \\ $$