\documentclass[12pt,a4paper,german]{article}
\usepackage{url}
%\usepackage{graphics}
\usepackage{times}
\usepackage[T1]{fontenc}
\usepackage{ngerman}
\usepackage{float}
\usepackage{diagbox}
\usepackage[utf8]{inputenc}
\usepackage{geometry}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{cancel}
\usepackage{wasysym}
\usepackage{csquotes}
\usepackage{graphicx}
\usepackage{epsfig}
\usepackage{paralist}
\usepackage{tikz}
\geometry{left=2.0cm,textwidth=17cm,top=3.5cm,textheight=23cm}

%%%%%%%%%% Fill out the the definitions %%%%%%%%%
\def \name {Valentin Brandl}					%
\def \matrikel {108018274494}				%
\def \pname {Marvin Herrmann}				%
\def \pmatrikel {108018265436}				%
\def \gruppe {2 (Mi 10-12 Andre)}
\def \qname {Pascal Brackmann}
\def \qmatrikel {108017113834}				%
\def \uebung {9}								%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 % DO NOT MODIFY THIS HEADER
\newcommand{\hwsol}{
\vspace*{-2cm}
\noindent \matrikel \quad \name \hfill \"Ubungsgruppe: \gruppe \\
\noindent \pmatrikel \quad \pname \\
\noindent \qmatrikel \quad \qname \\
\begin{center}{\Large \bf L\"osung f\"ur \"Ubung \# \uebung}\end{center}
}

\begin{document}
%Import header
\hwsol

\section*{Aufgabe 9.3}

\begin{enumerate}[1.]

    \item
        \begin{tabular}{|c|c|c|}
            \hline
            $eea(a,b)$ & $(d',x',y')$ & $(d,x,y)$ \\\hline\hline
            $eea(84,15)$ & $(3,-1,2)$ & $(3,2,-11)$ \\\hline
            $eea(15,9)$ & $(3,1,-1)$ & $(3,-1,2)$ \\\hline
            $eea(9,6)$ & $(3,0,1)$ & $(3,1,-1)$ \\\hline
            $eea(6,3)$ & $(3,1,0)$ & $(3,0,1)$ \\\hline
            $eea(3,0)$ &  & $(3,1,0)$  \\\hline
        \end{tabular}

        $ggt(84,15) = 84 * 2 + 15 * (-11) = 3$

    \item
        \begin{tabular}{|c|c|c|}
            \hline
            $eea(a,b)$ & $(d',x',y')$ & $(d,x,y)$ \\\hline\hline
            $eea(93,32)$ & $(1,10,-11)$ & $(1,-11,32)$ \\\hline
            $eea(32,29)$ & $(1,-1,10)$ & $(1,10,-11)$ \\\hline
            $eea(29,3)$ & $(1,1,-1)$ & $(1,-1,10)$ \\\hline
            $eea(3,2)$ & $(1,0,1)$ & $(1,1,-1)$ \\\hline
            $eea(2,1)$ & $(1,1,0)$ & $(1,0,1)$ \\\hline
            $eea(1,0)$ &  & $(1,1,0)$ \\\hline
        \end{tabular}

        $ggt(93,32) = 93 * (-11) + 32 * 32 = 1$

\end{enumerate}

\end{document}