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- x ≤ 2  ⇔ x ≥ - 2

- x /3 ≥ 1  ⇔   x /3 ≤ - 1   ⇔  x ≤ - 3

2 x - 1 = 8

2 x =  9

x = 9 /2

2 x - 1  < 8

2 x <  9

x <  9/2

] - ∞ : 9 / 2 [

4 - x = 3

- x =  3 - 4 = -  1

- x = - 1

x = 1

4  - x ≥ 3

- x ≥3 - 4

- x ≥ - 1

x ≤  1

] - ∞ ; 1 ]

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