\documentclass{article}
\usepackage{amsmath} % pkg required by EasyLatex
\usepackage{amsfonts} % pkg required by EasyLatex
\usepackage{amssymb} % pkg required by EasyLatex
\usepackage{psfrag} % pkg required by EasyLatex
\usepackage[dvips]{graphicx} % pkg required by EasyLatex
\begin{document}
\section*{ main section 1 }
hello
\begin{align*}
3 + 2 = 5
\end{align*}
\subsection*{ subsection 1 }
hi
\begin{align*}
2 + 9 = 7
\end{align*}
\subsubsection*{ subsubsection 1 }
bye
\begin{align*}
1 + 3 = 44
\end{align*}
\subsection*{ subsection 2 }
number 2 is my name
\section*{ mainSec 2 }
goodbye: $22 + 4 = 9$
\end{document}