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Factor[z^11 + 1991.5 * z^10 + 2985 * z^9 + 28 * z^2 + 55762 * z + 83580]
Factor[z^11 + 1991.5 * z^10 + 2985 * z^9 + 28 * z^2 + 55762 * z + 83580]
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