bonsoir
7 - 2 - 3 a < - 5 a + 15
- 3 a + 5 a < 15 - 7 + 2
2 a < 10
a < 5
S ] - ∞ ; 5 [
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bonsoir
7 - 2 - 3 a < - 5 a + 15
- 3 a + 5 a < 15 - 7 + 2
2 a < 10
a < 5
S ] - ∞ ; 5 [