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Sagot :

A = (2x² - 12x + 5x - 30) - (6x² - 8x - 15x + 20)

   = (2x² - 7x - 30) - ( 6x² - 23x + 20)

   = 2x² - 7x - 30 - 6x² + 23x - 20

   = - 4x² + 16x - 50

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