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9 < x + 3,2

9 - 3,2 < x

5,8 < x

x > 5,8

-4x >> 12

-12 >> 4x

-12/4 >> x

x << -3

x - 13 < 17

x < 17 + 13

x < 30

3x > 15

x > 15/3

x > 5

3x + 4 < 16

3x < 16 - 4

3x < 12

x < 12/3

x < 4

-5x/7 < 9

-9 < 5x/7

-9 * 7/5 < x

-63/5 < x

x > -63/5