\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath,amsfonts}
\usepackage{color}
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\begin{document}
\begin{equation*}
  \begin{aligned}
    & TF=\frac{PCF}{1+PC}, \quad & \quad
    & T=\frac{PC}{1+PC}, \quad & \quad
    & PS=\frac{P}{1+PC}, \\[1ex]
    & CFS=\frac{CF}{1+PC}, \quad & \quad
    & CS=\frac{C}{1+PC}, \quad & \quad
    & S=\frac{1}{1+PC}.
  \end{aligned}
\end{equation*}
\end{document}