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\usepackage{mathtools}
\usepackage{enumerate}
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% that's all folks

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\title{Year 9 Mathematics | Topic 1 | Algebra Revision}
\author{PEN Education}
\date{\today}


\setlength\parindent{0pt}


\begin{document}

\maketitle
\dotfill

\thispagestyle{fancy}

\tableofcontents

\dotfill
%\section{Introduction}
    %\input{1-introduction}
\section{Substitution}
    \input{2-substitution}
\section{Like Terms}
    \input{3-likes}
\section{Multiplication and Division}
    \input{4-multi}
\section{Simple Expansion of Brackets}
    \input{5-bracks}
\section{Binomial Products}
    \input{6-bin}
\section{Perfect Squares}
    \input{7-perf}
\section{Difference of Two Squares}
    \input{8-diff}

\section{Homework}
\input{9-homework}

\section{The End}
\hspace{4.5cm}
\input{10-outro}
\end{document}