$$6x^3-24x^2-18x+8 = 0$$
Answer
$$ \begin{matrix}x_1 = 0.31933 & x_2 = -0.90961 & x_3 = 4.59028 \end{matrix} $$
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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