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x² +6x+9-18+2x² +36x² -24x+4=39x² -18x-5
x²+6x+9-2(3x+9-x²-3x)+4+9x²-6x+1=
x²+6x+9-6x-18+2x²+6x+4+9x²-6x+1=6x²-4