$$x^6-124x^3-125 = 0$$
Answer
$$ \begin{matrix}x_1 = -1 & x_2 = 5 & x_3 = 0.5+0.86603i \\[1 em] x_4 = 0.5-0.86603i & x_5 = -2.5+4.33013i & x_6 = -2.5-4.33013i \end{matrix} $$
Explanation
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