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What are the roots of the equation x4−(a−b+c+d)x3+(cd−bc−bd+ac+ad−ab)x2−(−bcd+acd−abc−abd)x−abcd=0?x^4-(a-b+c+d)x^3+(cd-bc-bd+ac+ad-ab)x^2 \\ -(-bcd+acd-abc-abd)x-abcd=0?x4−(a−b+c+d)x3+(cd−bc−bd+ac+ad−ab)x2−(−bcd+acd−abc−abd)x−abcd=0?
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