Is there a generic way to solve cubic inequalities?

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Hi Pardon me if it has already been asked. I could not find any material on math-stack, hence asked this question! I have a cubic inequality of the form, \begin{equation} -a_1x^3+a_2x^2+a_3x+a_4<0 \end{equation} Is there a generic way to solve such cubic inequality? I am preferably looking for a scenario where this will have only one real root.