$$x^3-5x+2016 = 0$$
Answer
$$ \begin{matrix}x_1 = -12.76465 & x_2 = 6.38232+10.82599i & x_3 = 6.38232-10.82599i \end{matrix} $$
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