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<html filename="78d7d3642f3a4dbabbd1b017861aa5f2" display_name="Lesson 2: Let's Get Interactive!" source_code="\subsection{Example of E-text in LaTeX}&#10;&#10;It is very convenient to write complex equations in LaTeX.        &#10;&#10;\begin{equation}&#10;        x = \frac{-b\pm\sqrt{b^2-4*a*c}}{2a}&#10;\end{equation}&#10;&#10;Seize the moment.&#10;"/>