%% 
%%  An UIT Edition example
%% 
%%  Example 06-16-2 on page 119.
%% 
%%  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}{77}
\renewcommand\theequation{6.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{amsmath}
\newcommand*\diff{\mathop{}\!\mathrm{d}}
\StopShownPreambleCommands
\begin{document}
\begin{align}
  & \kern\fboxsep\kern\fboxrule f(x) = \int_1^{\infty}\frac{1}{x^2}\diff t = 1\\
  & \boxed{f(x) = \int_1^{\infty}\frac{1}{x^4}\diff t = \frac{1}{3}}
\end{align}
\end{document}