\documentclass[12pt, notitlepage]{article}

\usepackage{amsmath}
\usepackage{booktabs}
\usepackage{hyphsubst}
\usepackage[danish]{babel}
\usepackage{amsfonts}
\usepackage{breqn}
\usepackage{todonotes}
\usepackage{titling}
\usepackage{setspace}
\usepackage[utf8]{inputenc}
\usepackage[top=2.5cm, bottom=2.5cm, right=2.5cm, left=2.5cm]{geometry}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{float} % makes sure that tables are not repositioned
\captionsetup[table]{skip=10pt}

\begin{document}

\onehalfspacing