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x^3-8x^2+19x-12=0 (x^3-x)-(8x^2-20x+12)=0 x(x^2-1)-4(2x^2-5x+3)=0 x(x+1)(x-1)-4(x-1)(2x-3)=0 (x-1)(x^2+x-8x+12)=0 (x-1)(x-3)(x-4)=0 x=1,x=3,x=4
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