Ecuación larga que se fusiona con el texto de la segunda columna en formato IEEEtran.cls de doble columna

Question

     \documentclass[journal]{IEEEtran}

    \IEEEoverridecommandlockouts
    \usepackage{url}
    \usepackage{footnote}
    \usepackage{tablefootnote}
    \usepackage{amssymb}
    \usepackage[fleqn]{amsmath}
    \usepackage{bm}
    \usepackage{placeins} 
    \usepackage{textcomp}
    \usepackage{amsmath,amssymb,amsfonts}
    \usepackage{breqn}
    \usepackage{diagbox}
    \usepackage{csquotes}
    \usepackage{mathtools}
    \usepackage{algorithmic}
    \usepackage{graphicx}
    \usepackage{subfig}
    \usepackage[linesnumbered,ruled,vlined]{algorithm2e}
    \usepackage{float,caption}
    \renewcommand{\arraystretch}{1}
    \setlength{\tabcolsep}{4pt}
    \usepackage{textcomp}

    \usepackage{xcolor}
    \usepackage{ mathrsfs }
    \def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
    T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
    \providecommand{\nr}[1]{\textcolor{red}{[{\bf #1}]}}
    \newcommand{\subparagraph}{}
    \usepackage[compact]{titlesec}  
    \usepackage{cuted}
    \usepackage{makecell}
    \renewcommand\theadalign{bc}
    \renewcommand\theadfont{\bfseries}
    \renewcommand\theadgape{\Gape[4pt]}
    \renewcommand\cellgape{\Gape[4pt]}
    \usepackage{hyperref}

Answer 1

Anhelo comentar y solo adivinar... sin embargo, puedes hacerte una idea de lo que puedes hacer (al menos para preparar tu MWE, que necesitamos y limpiar tu preámbulo):

\documentclass[journal]{IEEEtran}

\IEEEoverridecommandlockouts
%\usepackage{url} loaded by hyperref
\usepackage{footnote}
\usepackage{tablefootnote}
%%%% collected to math related packages, which one you really need?
%\usepackage{amssymb}
%\usepackage[fleqn]{amsmath}
%\usepackage{bm}
%\usepackage{amsmath,amssymb,amsfonts}
%\usepackage{breqn}
\usepackage{mathtools}% also load amsmath
%\usepackage{ mathrsfs }

\usepackage{placeins}
\usepackage{textcomp}
\usepackage{diagbox}
\usepackage{csquotes}
\usepackage{graphicx}
\usepackage{subfig}
\usepackage{algorithmic}
\usepackage[linesnumbered,ruled,vlined]{algorithm2e}
\usepackage{float,caption}
\renewcommand{\arraystretch}{1}
\setlength{\tabcolsep}{4pt}
\usepackage{textcomp}

\usepackage{xcolor}
\def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
\providecommand{\nr}[1]{\textcolor{red}{[{\bf #1}]}}
\newcommand{\subparagraph}{}
\usepackage[compact]{titlesec}
\usepackage{cuted}
\usepackage{makecell}
\renewcommand\theadalign{bc}
\renewcommand\theadfont{\bfseries}
\renewcommand\theadgape{\Gape[4pt]}
\renewcommand\cellgape{\Gape[4pt]}
\usepackage{hyperref}

\usepackage{lipsum}    % added for text filler
\begin{document}
\lipsum[1]
    \begin{multline} % equation is a slightly shorter now ...
\text{short left part} =    \\
\sum_{i=0}^{\infty} \text{very, very, very ,very  long right part of equation}
    \end{multline}
\lipsum[2-11]
\end{document}

resultado: