Bonjour pouvez vous m aider svp réduire les expressions suivantes

A= 2x² +3x + 5 -x² + 2 x - 4
B=6x²-5x+9-7x²+3x-3
C=6x-5x²+7-x²+3x-12
D=5+6x-3+7x²-x-9+x²-12x²-4x-10
E=x²+6-8x+x²-3x²+5+3x²-3x-2x²​
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