-2(x+3)²-(x-3)(x+4)+7-x²=-2(x²+6x+9)-(x²+x-12)+7-x²=
=-2x²-12x-18-x²-x+12-x²=-4x²-13x-6
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-2(x+3)²-(x-3)(x+4)+7-x²=-2(x²+6x+9)-(x²+x-12)+7-x²=
=-2x²-12x-18-x²-x+12-x²=-4x²-13x-6