\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
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\begin{document}

Test of finding single line naked eqn

\begin{align*}
B_{new} = B - X_{IN} + X_{OUT}
\end{align*}


\end{document}