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Sagot :

A = (x - 6)(x - 7) - (3x - 6)²

A = x² - 7x - 6x + 42 - (9x² - 36x + 36)

A = x² - 13x + 42 - 9x² + 36x - 36

A = -8x² - 23x + 6

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