Bonsoir
3 x - 1 ≤ 3
3 x ≤ 3 + 1
3 x ≤ 4
x ≤ 4/3
] - ∞ : 4/3 ]
x /4 - 1/5 ≥ - 2/5 + 3 x
5 x /20 - 4/20 ≥ - 8/20 + 60 x /20
5 x - 60 x ≥ - 8 + 4
- 55 x ≥ - 4
x ≤ 4/55
] - ∞ ; 4/55 ]
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Bonsoir
3 x - 1 ≤ 3
3 x ≤ 3 + 1
3 x ≤ 4
x ≤ 4/3
] - ∞ : 4/3 ]
x /4 - 1/5 ≥ - 2/5 + 3 x
5 x /20 - 4/20 ≥ - 8/20 + 60 x /20
5 x - 60 x ≥ - 8 + 4
- 55 x ≥ - 4
x ≤ 4/55
] - ∞ ; 4/55 ]