\documentclass[11pt]{article}
\usepackage[a4paper,margin=2.5cm]{geometry}
\usepackage{amsmath,graphicx}
\title{A Concise Academic Article}
\author{LatexDesk Example}
\date{\today}
\begin{document}
\maketitle
\begin{abstract}
This example demonstrates the essential structure of a short academic article.
\end{abstract}
\section{Introduction}
Clear structure helps readers understand the research question and contribution.
\section{Method}
We describe a reproducible method and define the mean
\begin{equation}
  \bar{x}=\frac{1}{n}\sum_{i=1}^{n}x_i.
\end{equation}
\section{Results}
The example compiles with pdfLaTeX and uses only common packages.
\section{Conclusion}
Replace this text with your own findings and references.
\end{document}