Bonjour j'ai besoins d'aide svp je suis en galère total

Exercice 3: Réduire les expressions
suivantes :
A = (x + 3) - (x + 5) - (x-7)
B = (a + 4) + (-a-5)+(3-a)
C = (x²-x) - (x-1)-(1-x²)
D=x²-(3x² - 5x²)+(x² - 8x) - 2ײ ​
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