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%%
%% An UIT Edition example
%%
%% Example 06-19-1 on page 121.
%%
%% 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}}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{gather*}
\begin{align*}
m_2 &= m_2' + m_2''\\
&= \frac{V_2'}{v_2'} + \frac{V_2''}{v_2''}
\end{align*}\\
\Rightarrow m_2 v_2' = V - V_2'' + V_2''\frac{v_2'}{v_2''}
\end{gather*}
\begin{gather*}
\begin{align*}
m_2 &= m_2' + m_2''\\
&= \frac{V_2'}{v_2'} + \frac{V_2''}{v_2''} & %<<<====
\end{align*}\\
\Rightarrow m_2 v_2' = V - V_2'' + V_2''\frac{v_2'}{v_2''}
\end{gather*}
\end{document}
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