9. $\{-3,3\}$

11. $\{-3,3\}$

13. $\{-5,-1\}$

15. $\{-1,7\}$

17. $\left\{-{\displaystyle \frac{7}{6}},{\displaystyle \frac{11}{6}}\right\}$

19. $\{-2,-1\}$

21. $\{-6,6\}$

23. $\{-20,4\}$

25. $\{-1,2\}$

27. $\varnothing$

29. $\varnothing$

31. $\{-2,2\}$

33. $\{-1,2\}$

35. $\left\{-{\displaystyle \frac{1}{3}},1\right\}$

37. $\{-4\}$

39. $\left\{-3,-{\displaystyle \frac{5}{9}}\right\}$

41. $\{0,2\}$

43. $\left\{{\displaystyle \frac{5}{4}},{\displaystyle \frac{3}{2}}\right\}$

45. $\varnothing$

47. $(-4,4)$

49. $(-\infty ,-4)\cup (4,\infty )$

51. $(-4,2)$

53. $(-\infty ,\infty )$

55. $\left(-{\displaystyle \frac{1}{2}},{\displaystyle \frac{7}{2}}\right)$

57. $(-\infty ,1)\cup (4,\infty )$

59. $\left[-{\displaystyle \frac{23}{3}},5\right]$

61. $\varnothing$

63. $\left(-{\displaystyle \frac{1}{2}},\infty \right)$

65. $(-\infty ,-6]\cup [0,\infty )$

67. $[-5,-2)\cup (-2,-1]$

69. $\left({\displaystyle \frac{1}{2}},1\right)\cup \left(1,{\displaystyle \frac{5}{2}}\right)$

71. $\left(-\infty ,{\displaystyle \frac{11}{5}}\right]\cup [3,\infty )$