преобразуйте в многочлен (x - 1)(x+1)-(x+2)(x+3
x^2+x-x-1-(x^2+3x+2x+6)=x^2-1-x^2-5x-6=-5x-7
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x^2+x-x-1-(x^2+3x+2x+6)=x^2-1-x^2-5x-6=-5x-7