\begin{equation}x^{2}=36\end{equation}

\begin{equation}7x^{2}-343=0\end{equation}

\begin{equation}8x^{2}=72\end{equation}

\begin{equation}5(x-5)(x-4)=0\end{equation}

\begin{equation}\frac{1}{x+10}=\frac{x^{2}}{x^{2}-100}-(\frac{1}{x-10})\end{equation}

\begin{equation}\frac{1}{5} \times (x+6)(x-6)=0\end{equation}