\begin{equation}\frac{21}{2} \times x=5+8x\end{equation}

\begin{equation}10x+7=10x+7\end{equation}

\begin{equation}8x+3-8x=x-1\end{equation}

\begin{equation}7x-4=7x-4\end{equation}

\begin{equation}(-9)x+63=3x-9\end{equation}

\begin{equation}3(9x-2)=25x\end{equation}

\begin{equation}10x+7(4x+7)=\frac{239}{5} \times x\end{equation}

\begin{equation}4x+4-3x=\frac{7}{13} \times (x+10)\end{equation}

\begin{equation}10(x+5)=9(x+6)+3\end{equation}

\begin{equation}\frac{1}{3} \times x+\frac{2}{3}=4\end{equation}

\begin{equation}\frac{1}{4} \times x+\frac{1}{7}=\frac{\frac{27}{7}}{6}\end{equation}

\begin{equation}\frac{9}{2} \times x-26=\frac{3}{8} \times x+7\end{equation}