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+\documentclass[]{article}
+\usepackage[utf8]{inputenc}
+\usepackage[upright]{fourier}
+\usepackage{amsmath,tkz-linknodes}
+
+\thispagestyle{empty}
+\begin{document}
+This example is from MathMode.pdf of Herbert Vo\ss
+
+\begin{NodesList}[margin=1cm]
+ \begin{displaymath}\displaywidth=.2\linewidth
+ \begin{aligned}
+ y &= 2x^2 -3x +5 \AddNode\\
+ & \hphantom{= \ 2\left(x^2-\frac{3}{2}\,x\right. }%
+ \textcolor{blue}{%
+ \overbrace{\hphantom{+\left(\frac{3}{4}\right)^2- %
+ \left(\frac{3}{4}\right)^2}}^{=0}} \\
+ &= 2\left(\textcolor{red}{%
+ \underbrace{%
+ x^2-\frac{3}{2}\,x + \left(\frac{3}{4}\right)^2}%
+ }%
+ \underbrace{%
+ - \left(\frac{3}{4}\right)^2 + \frac{5}{2}}%
+ \right) \AddNode\\
+ &= 2\left(\qquad\textcolor{red}{\left(x-\frac{3}{4}\right)^2}
+ \qquad + \ \frac{31}{16}\qquad\right) \AddNode\\
+y
+ &= 2\left(x\textcolor{cyan}{-\frac{3}{4}}\right)^2\textcolor{blue}{+\frac{31}{8}}\AddNode
+\end{aligned}
+ \end{displaymath}
+{%
+\tikzset{LabelStyle/.append style = {left,text=red}}
+ \LinkNodes{%
+ \begin{minipage}{5cm}
+ $2x^2 -3x$ is the beginning of an algebraic identity %
+ (binomial formula)
+ \end{minipage}}
+ \LinkNodes{$(a-b)^2=a^2-2ab+b^2$}
+ \LinkNodes{after simplication, the result is}%
+}
+ \end{NodesList}
+
+
+\end{document} \ No newline at end of file