\documentclass[a4paper]{article}

% Packages
\usepackage[a4paper, inner=2.5cm, outer=2.5cm, top=2.5cm, bottom=2cm, bindingoffset=0cm]{geometry}
\usepackage{amsmath,amsthm,amssymb,amsfonts}
\usepackage{graphicx}
\usepackage[colorlinks=true, allcolors=blue]{hyperref}
\usepackage{fontspec,xunicode,xltxtra}
\usepackage{biblatex}

% GERMAN
%\usepackage[ngerman=ngerman-x-latest]{hyphsubst}
%\usepackage[ngerman]{babel}

% ENGLISH
\usepackage[USenglish]{babel}
\usepackage{hyphsubst}

% Figures
\graphicspath{{figures/}}

% Citations
\addbibresource{bib/main.bib}

\begin{document}

\title{Awesome paper}
\author{Marvin Borner}
\date{\today}

\maketitle

%\tableofcontents

\begin{abstract}
	Writing a professional paper in latex can be hard and exhausting. It takes a long time to compile but it's just the best option if you need a flawless vectorized font with a specific instruction set.
\end{abstract}

\section{Introduction}
Welcome back!

\begin{equation}
	\label{simple_equation}
	\alpha = \sqrt{\beta}
\end{equation}

%\includegraphics[width=0.5\textwidth]{test}

%\printbibliography[heading=bibintoc]

\end{document}