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(x-4)²+5x(x-3)×(x+3)+2(x+5)² =x²+16+5x²-15x+x²+3x+2*(x²+25)=
7x²+16-12x+2x²+50=9x²+66-12x=9*1/2²+66*1/2-12*1/2=
2¼+33+6=41¼