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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-2-8 on page 473.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%%    Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{ttctexamargin}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{207.0pt}
+
+\StartShownPreambleCommands
+\usepackage[tbtags]{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}
+ \begin{split}
+  (a + b)^3 &= (a + b) (a + b)^2        \\
+            &= (a + b)(a^2 + 2ab + b^2) \\
+            &= a^3 + 3a^2b + 3ab^2 + b^3
+ \end{split}
+\end{equation}
+\end{document}