$\left\{\begin{matrix}x=-\frac{\sqrt{10248eR+324\left(eR\right)^{2}+67081}-18eR-259}{2eR}\text{; }x=\frac{\sqrt{10248eR+324\left(eR\right)^{2}+67081}+18eR+259}{2eR}\text{, }&R\neq 0\\x=-\frac{33}{37}\approx -0.891891892\text{, }&R=0\end{matrix}\right.$

$\left\{\begin{matrix}x=-\frac{\sqrt{10248eR+324\left(eR\right)^{2}+67081}-18eR-259}{2eR}\text{; }x=\frac{\sqrt{10248eR+324\left(eR\right)^{2}+67081}+18eR+259}{2eR}\text{, }&R\leq -\frac{84\sqrt{2563}+10248}{648e}\text{ or }\left(R\neq 0\text{ and }R\geq \frac{84\sqrt{2563}-10248}{648e}\right)\\x=-\frac{33}{37}\approx -0.891891892\text{, }&R=0\end{matrix}\right.$