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Sagot :

E=[7x*2x-7x*6]+[3x*2x-4*2x-6*3x-4*(-6)]
E=14x^2-42x+6x^2-8x-18x+24
E=20x^2-62x+24

E=20*(-2)^2-62*(-2)+24
E=-80+124+24
E=68

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