$$-1452x^3+484x^2+3993x+2311 = 0$$
Answer
$$ \begin{matrix}x_1 = 2.05174 & x_2 = -0.8592+0.19364i & x_3 = -0.8592-0.19364i \end{matrix} $$
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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Polynomial Equations Solver