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(x^3-3x^2+6x-18)/(x^2-4x)*(2x-4)/(x^4-3x^3)÷(x^2+2x-8)/(16-x)
(x^3-3x^2+6x-18)/(x^2-4x)*(2x-4)/(x^4-3x^3)÷(x^2+2x-8)/(16-x)
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