%% 
%%  Example 07-05-4 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}
\setlength\parindent{0pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\begin{equation}
\binom{x_R}{y_R} = \underbrace{r\vphantom{\binom{A}{B}}}_{\text{Scaling}}\cdot%
  \underbrace{%
    \begin{pmatrix}
      \sin \gamma & -\cos \gamma \\ \cos \gamma & \sin \gamma \\
      \end{pmatrix}
  }_{\text{Rotation}}
\binom{x_K}{y_K} + \underbrace{\binom{t_x}{t_y}}_{\text{Translation}}
\end{equation}
\end{document}
