\documentclass{article}
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\title{Test}

\author{Authors}
  
\date{}

\usepackage{amssymb}
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\begin{document}

\maketitle

\begin{abstract}
  This is the abstract.

\end{abstract}

\DIFdelbegin \section{\DIFdel{Section X}}
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\DIFdel{Some text comes here:
}\begin{eqnarray*}\DIFdel{
  r_{i} }& \DIFdel{= }& \DIFdel{\max(}{\DIFdel{r_{i}}}\DIFdel{',w_{i})  \label{eq:qrms_adm2}
}\end{eqnarray*}
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\DIFdel{With Equation~\ref{eq:qrms_adm2} we ensure that there is enough
reservation for the mandatory part by potentially increasing the
reservation to the worst case execution time of the mandatory part}\DIFdelend \DIFaddbegin \DIFadd{Other text now}\DIFaddend .

\end{document}
