We can embed the long equation into a floating figure. This works for IEEE conference/journal submissions.

\begin{figure*}[!t]

\normalsize

\begin{equation}

….

\end{equation}

\hrulefill

\vspace*{4pt}

\end{figure*}

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We can embed the long equation into a floating figure. This works for IEEE conference/journal submissions.

\begin{figure*}[!t]

\normalsize

\begin{equation}

….

\end{equation}

\hrulefill

\vspace*{4pt}

\end{figure*}