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\[\begin{eqnarray}
\begin{cases}
x + 2y = 3 & \tag{1}\\
4 + 5y = 6 &
\end{cases}
\end{eqnarray}\]

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Mathtodon

A Mastodon instance named Mathtodon, where you can post toots with beautiful mathematical formulae in TeX/LaTeX style.