\begin{equation}(x-2)(x-8)=0\end{equation}

\begin{equation}10(x-7)x=0\end{equation}

\begin{equation}(6x-1)(x-6)=0\end{equation}

\begin{equation}(2x+9)(2x-9)=0\end{equation}

\begin{equation}(2x-3)(8x-9)=0\end{equation}

\begin{equation}x^{2}+10x+21=0\end{equation}

\begin{equation}x^{2}=(-11)x-18\end{equation}

\begin{equation}x^{2}+4x+4=0\end{equation}

\begin{equation}9x^{2}-81=0\end{equation}

\begin{equation}-(x^{2}+5x-24)=0\end{equation}

\begin{equation}(-6)(x^{2}+5x-36)=0\end{equation}

\begin{equation}x^{2}+56x+64=0\end{equation}

\begin{equation}-(7x^{2}+36x-81)=0\end{equation}

\begin{equation}10(2x^{2}+55x-72)=0\end{equation}

\begin{equation}5(x^{2}-64)=0\end{equation}

\begin{equation}9(81x^{2}+144x+64)=0\end{equation}

\begin{equation}18x^{2}=72\end{equation}

\begin{equation}(-5)(x^{2}-2x+1)=0\end{equation}

\begin{equation}36x^{2}-12x+1=0\end{equation}

\begin{equation}8(25x^{2}+10x+1)=0\end{equation}

\begin{equation}2(81x^{2}-18x+1)=0\end{equation}

\begin{equation}8(x^{2}+16x+64)=0\end{equation}

\begin{equation}49x^{2}=(\frac{6}{8})^{2}\end{equation}