Calculus
(−7,0)∪(0,7)\left(-7,0\right)\cup\left(0,7\right)
(−∞,−7)∪(−7,0)∪(0,7)∪(7,∞)\left(-\infty,-7\right)\cup\left(-7,0\right)\cup\left(0,7\right)\cup\left(7,\infty\right)
(−∞,−7)∪(7,∞)\left(-\infty,-7\right)\cup\left(7,\infty\right)
(−∞,−7]∪[7,∞)\left(-\infty,-7\right\rbrack\cup\left\lbrack7,\infty\right)