\documentclass[14pt]{article}

\def\E{}
\renewcommand{\E}[2][]{\ensuremath\mathrm{E}_{#1}\!\left[#2\right]}
\def\PP{\ensuremath\mathrm{P}}

\begin{document}

\begin{equation}
    \PP[x\le y] = \E[x]{\max(y-x,0)/(y-x)}
\end{equation}

\end{document}
