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Bonjour,

4x + 1 + 9x - 8 = 4x + 9x + 1 - 8 = 13x - 7

y² - 3y + 5 - 3y² + 7y - 6 = y² - 3y² - 3y + 7y + 5 - 6 = -2y² + 4y - 1

7 * 3x = (7 * 3)x = 21x

(-9x) * (-8) = (-9 * -8)x = (9 * 8)x = 72x

4x * (-3) = (4 * -3)x = -12x

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