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Sagot :

AYUDA

si A = B

alors il faut résoudre

5x - 9 = (-4 + x) * (-3)

soit

5x - 9 = -3*(-4) - 3 *x

5x - 9 = 12 - 3x

5x + 3x = 12 + 9

8x = 21

x =21/8

x = 6,5625

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