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(x + 4) / (x3 - 11x + 20)

= (x + 4) / (x2 + 4x - 5)(x + 4)

= 1 / (x2 + 4x - 5)

= 1 / (x + 5)(x - 1), where x ≠ -4

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Q: What is x plus 4 divided by x3 -11x plus 20?
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