%% %% An UIT Edition example %% %% Example 09-17-9 on page 190. %% %% Copyright (C) 2010 Herbert Voss %% %% 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. %% %% %% ==== % Show page(s) 1 %% \documentclass[]{exaarticle} \pagestyle{empty} \setlength\textwidth{375.57637pt} \AtBeginDocument{\setlength\parindent{0pt}} \setcounter{equation}{28} \renewcommand\theequation{9.\arabic{equation}} \StartShownPreambleCommands \usepackage{mathtools} \newcounter{linecnt}\renewcommand\thelinecnt{(\alph{linecnt})} \newcommand\stepline{\stepcounter{linecnt}\thelinecnt} \newgathered{agathered}{\llap{\stepline}\quad\hfil}{\hfil}{\setcounter{linecnt}{0}} \StopShownPreambleCommands \begin{document} \begin{align} \begin{agathered} i_{11}+i_{21}=0.25\\ i_{21}=\frac{1}{3}i_{11}\\ i_{31}=0.33i_{22}+i_{11}-0.1i_{21} \end{agathered}\\[7pt] \begin{agathered} f(x)=3x+4\\ g(x)=\sqrt{x^2-1}\\ h(x)=\frac{1}{x} \end{agathered} \end{align} \end{document}