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\newtheoremstyle{satzstyle}{5mm}{5mm}{ \addtolength{\leftskip}{5mm} 
\addtolength{\rightskip}{5mm} }{-0.3 cm}{}{}{\newline}
{\textcolor{darkred}{\textsc{\textbf{#1} #2}} \quad  \textbf{#3}}

\theoremstyle{satzstyle}	
\newtheorem{satzf}{Satz}[section]

\newenvironment{satz+c}[1][]{\definecolor{shadecolor}{rgb}{0.98, 0.95, 0.95}
%\definecolor{framecolor}{rgb}{0,0,0}
\begin{samepage}\begin{shaded}\begin{satzf}[#1]}{\end{satzf}\end{shaded}\end{samepage}}

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\newenvironment{satz+c}[1][]{\Needspace*{5\baselineskip}\definecolor{shadecolor}{rgb}{0.98, 0.95, 0.95}
%\definecolor{framecolor}{rgb}{0,0,0}
\begin{shaded}\begin{satzf}[#1]}{\end{satzf}\end{shaded}}