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x^2+x+1=0 x^2+x=-1 x^3+2x^2+2x+3 =x^3+x^2+x^2+2x+3 =x(x^2+x)+x^2+2x+3 =-x+x^2+2x+3 =x^2+x+3 =-1+3 =2
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