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Sagot :

3(x-y+2a)
(X-4)((3x-1)-(7x+1))
7(a+1)
5(x-2)
a((3a-4)-1)
1: 3(x-y+a)
2: (x-4)(3x-1-7x-1)= (x-4)(-4x-2)
3: 7(a+1)
4: 5(x-2)
5: a(3a-4-1)
3:

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