\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath,amsfonts}
\usepackage{color}
\pagestyle{empty}
\begin{document}
\begin{equation*}
  L(s) = k_i P'(0) + \frac{k_i P(0)}{s}
\end{equation*}
\end{document}