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Sagot :

A = 2x-3+4x²+7-5x+x²

= 5x² -3x+4

 A=2x -3+4x²+7-5x+x²

A= 2x - 5x - 3 + 7 + 4x² + x² 
A = -3x + 4 + 5x²  

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