$$2x^3-x^2+3x+9 = 0$$
Answer
$$ \begin{matrix}x_1 = -1.23517 & x_2 = 0.86758+1.70015i & x_3 = 0.86758-1.70015i \end{matrix} $$
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