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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 \ No newline at end of file