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(x-1)/x-(8x+a)/2x(x-1)+x/(x-1)=0 2(x-1)^2-(8x+a)+2x^2=0 2x^2-4x+2-8x-a+2x^2=0 4x^2-12x+2-a=0 △=144-16(2-a)=112+16a≥0 7+a≥0 a≥-7
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