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+%%
+%% Ein Beispiel der DANTE-Edition
+%% Mathematiksatz mit LaTeX
+%% 3. Auflage
+%% Beispiel 09-26-3 auf Seite 207.
+%% Copyright (C) 2018 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[10pt]{exaartplain}
+\pagestyle{empty}
+\setlength\textwidth{170.40707pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+%StartShownPreambleCommands
+\usepackage{witharrows}% lädt automatisch tikz
+\usetikzlibrary{calc}
+%StopShownPreambleCommands
+\begin{document}
+$\begin{WithArrows}[ll,interline=5mm,xoffset=5mm,
+ TikzCode={\draw[rounded corners,
+ every node/.style = {circle, draw, auto = false,
+ inner sep = 1pt, fill = gray!50, font = \tiny }]
+ let \p1 = (#1), \p2 = (#2) in
+ \ifdim \x1 > \x2 (\p1) --
+ node {#3} (\x1,\y2) -- (\p2)
+ \else (\p1) -- (\x2,\y1) -- node {#3} (\p2)
+ \fi ;} ]
+E & \Longleftrightarrow \frac{(x+4)}3 +
+ \frac{5x+3}5 = 7 \Arrow{$\times 15$}\\
+& \Longleftrightarrow 5(x+4) + 3(5x+3) = 105 \\
+& \Longleftrightarrow 5x+20 + 15x+9 = 105 \\
+& \Longleftrightarrow 20x+29 = 105 \Arrow{$-29$}\\
+& \Longleftrightarrow 20x = 76 \Arrow{$\div 20$}\\
+& \Longleftrightarrow x = \frac{38}{10}
+\end{WithArrows}$
+\end{document}