Remove aruqivo não necessário.

parent c1c3dfc3
\documentclass{rbef}
\begin{document}
\duascolunas
Um texto e tal.
\umacoluna
\begin{widetext}
\begin{equation}
a + b^2 = 3
\end{equation}
\end{widetext}
\duascolunas
Um texto e tal.
\fim
\end{document}
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