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Svp aidez moi je comprend pas

Réduire.
A = 6x² + 9x + 3x²-6-2r
B = 11x + 7x-6x²-2r-4r²
C = 8x+5-2r²²-7x-15+8r²
D=61² + 3x + 12r-9-10²+x-4

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