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\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}
\begin{eqnarray*}
Ax &=& b
\\x &=& A^{-1} b
\end{eqnarray*}
\end{document}
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