24-16x+3x²-(15-8x-4x²)=24-16x+3x²-15+8x+4x²=3x²+4x²-16x+8x+24-15=
=7x²-8x+9
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24-16x+3x²-(15-8x-4x²)=24-16x+3x²-15+8x+4x²=3x²+4x²-16x+8x+24-15=
=7x²-8x+9