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\[\lbrack\)7,\(\infty\]\right\))