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+%%
+%% The LaTeX Companion, 3ed
+%%
+%% Example 11-2-34 on page II-150 in "Equation numbering and tags".
+%%
+%% Copyright (C) 2022 Frank Mittelbach
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3c
+%% of this license or (at your option) any later version.
+%%
+%% See https://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{tlc3examargin}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{207.0pt}
+
+%StartShownPreambleCommands
+\usepackage{amsmath}
+%StopShownPreambleCommands
+
+\begin{document}
+\begin{align}
+ x^2+y^2 &= z^2 \label{eq:A} \\
+ x^3+y^3 &= z^3 \notag \\
+ x^4+y^4 &= r^4 \tag{$*$} \\
+ x^5+y^5 &= r^5 \tag*{$*$} \\
+ x^6+y^6 &= r^6 \tag{\ref{eq:A}$'$}
+\end{align}
+\end{document}