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Sagot :

Bonjour,

(7x+3)/15 ≥2/5

(7x+3) ≥ (2/5) *15

7x+3 ≥ 30/5

7x+3 ≥ 6

7x ≥  6-3

7x ≥ 3

x ≥ 3/7

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