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Sagot :

a) = 7a-7 = 7(a-1)
b) =3b+14
c) =3-3a = 3(1-a)
d) =-2a+14b = 2( -a+7b)
7(a-1)
3b+14
3(1-a)
et voila le denier essay de le faite

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