Polynomial started

Algebra Level 4

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

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