$$-x^3+136x^2-7197x+11160 = 0$$
Answer
$$ \begin{matrix}x_1 = 1.59836 & x_2 = 67.20082+49.66113i & x_3 = 67.20082-49.66113i \end{matrix} $$
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