developper (2x-3)(-x+7)-(5x+3)² merci d avnace
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(2x-3)(-x+7)-(5x+3)²-2x² +14x +3x -21 - (25x² + 30x +9)
-2x² +17x -21 - 25x² -30x -9
-27x² - 13x - 30