bonjour;
A=12x+7-9x+1.
=3x +8
B= -6x²+12x-6x²+10x-20.
= -12x² +22x -20
C=3x²-10x+3+5x²+8x-7
= 8x² -2x -4
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bonjour;
A=12x+7-9x+1.
=3x +8
B= -6x²+12x-6x²+10x-20.
= -12x² +22x -20
C=3x²-10x+3+5x²+8x-7
= 8x² -2x -4