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Sagot :

bonjour

(2-2x)(1+5x)-3(x-1)(3x+7)

= 2 (1 - x) (1 + 5x) + 3 (1 - x) (3x + 7)

= (1-x) [2(1+3x)+3(3x+7)]

= (1-x) (2+6x+9x+21)

=(1-x) (15x+23)

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