Svp aidez moi:... A=3a-2b+5-a-b-7.
B=9x²-2x+1-4x²-3x-5.
C=(3x²-x-3)+(x²-1)-(2x+3).
D=(-x²+x-3)-(2x²+x-5)-(1-2x-5x²).
....et merci d'avance
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