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\documentclass[]{article}
\usepackage[utf8]{inputenc}
\usepackage[upright]{fourier}
\usepackage{tkz-linknodes}
\thispagestyle{empty}
\begin{document}
\parindent=0pt
\begin{center}
\fbox{%
\begin{minipage}{10cm}
\begin{NodesList}[margin=2 cm]
\begin{align}
3\left(x^2-\frac{2}{3}\right) &= 4 \AddNode\\
3x^2-2 &= 4 \AddNode\\
3x^2 &= 6 \AddNode\\
\intertext{\hfil isolate the term with the variable \hfil}
x^2 &= 2 \AddNode\\
\sqrt{x^2} &= \sqrt{2} \AddNode\\
|x| &= \sqrt{2} \AddNode\\
x &= \pm\sqrt{2} \AddNode
\end{align}
\LinkNodes{expand}%
\LinkNodes{$+2$}%
\LinkNodes{$\div 3$}
\LinkNodes{$\sqrt{\ldots}$}
\LinkNodes{$\sqrt{x}=|x|$}
\LinkNodes{so that}
\end{NodesList}
\end{minipage}}
\end{center}
\end{document}
% Encoding : utf8
% Author : Alain Matthes (2008)
% Engine : pdfLaTeX (LaTeX only with pdftex >= 1.40)
% Packages : xkeyval, tikz with arrow library, amsmath, etex, ifthen
% Remark : needs two compilations
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