\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath,amsfonts}
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\begin{document}
\begin{equation*}
  \dot x = F(x_e) + \left.\frac{\partial F}{\partial x}\right|_{x_e} (x - x_e) +
  \text{higher order terms in $(x-x_e)$}.
\end{equation*}
\end{document}