Find the range of xxx satisfying 1x−3>2x+1\frac{1}{x-3} > \frac{2}{x+1}x−31>x+12.
(−1,3)∪(7,∞)(-1, 3) \cup (7, \infty)(−1,3)∪(7,∞)
(−∞,−1)∪(3,7)(-\infty, -1) \cup (3, 7)(−∞,−1)∪(3,7)
(−1,7)(-1, 7)(−1,7)
(3,7)(3, 7)(3,7)