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12345678910111213141516171819 \documentclass{aa}\begin{document}\begin{equation} A B, \label{eq1}\end{equation}\begin{equation} A $ B,$ \label{eq2}\end{equation}\begin{equation} A $$ \label{eq3}\end{equation}\end{document}
\documentclass{aa}
\begin{document}
\begin{equation}
A B,
\label{eq1}
\end{equation}
A $ B,$
\label{eq2}
A $$
\label{eq3}
\end{document}