Question
$$x^4+x^3+99 = 736$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} x^4+x^3+99 &= 736&& \text{move all terms to the left hand side } \\[1 em]x^4+x^3+99-736 &= 0&& \text{simplify left side} \\[1 em]x^4+x^3-637 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using quartic formulas
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Polynomial Equations Solver