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+\documentclass{article}
+\begin{document}
+
+More LaTeX practice related to the video at http://www.khanacademy.org/math/algebra/solving-linear-equations/v/simple-equations 
+
+\begin{eqnarray*}
+7x & = & 14 \\
+7 \times x & = & 14 \\
+\frac{7x}{7} & = & \frac{14}{7} \\
+x & = & 2
+\end{eqnarray*}
+
+\end{document}