$$x^3-3x^2-3x+11 = 0$$
Answer
$$ \begin{matrix}x_1 = -1.84732 & x_2 = 2.42366+0.28361i & x_3 = 2.42366-0.28361i \end{matrix} $$
Explanation
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
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