Bonjour, Je dois factoriser des expressions mais je n'y arrive pas pourriez-vous m'aider svp ?

A= 15x²+3x
B= (x+4)(2x-5)-(x-3)(x+4)
C= (2x+5)(x-3)+3(x-3)²
D= (7x-2)(4x+1)-(7x-2)
E= (3x+1)²-(3x+1)
F= (x-3)+3(x-3)(x+1)

Merci d'avance
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