I am using fleqn
for amsmath. So the euqation is default left-aligned.
Now I want to teamporarily make one equation center-aligned. How to do this?
MWE
\documentclass{article}
\usepackage{ragged2e}
\usepackage[fleqn]{amsmath}
\begin{document}
\section{left-align}
\begin{equation}
y = x
\end{equation}
\section{center-align}
\begin{equation}
\centering
y = x + x
\end{equation}
\end{document}