Bonjour pouvez vous m’aidez c’est pour demain merci d’avance

ex: supprimer les parenthèses et réduire :
A = 7y - (3y - 5)
B = 4x + (-5x + 7)
C = -4x² - (-7 + 4x) + (7x² - 3x)
D = -(7a - 5) + (3a - 4 + 5a²)
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