Réponse:
2 x 2.5 - 1
3 x -5 + 15
5 - 7
4 + 5 x -2
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Réponse:
2 x 2.5 - 1
3 x -5 + 15
5 - 7
4 + 5 x -2
3x+15=0 -> -5
5-x=-2 -> 7
4+5x=-6 -> -2