latex中方程组的编号应如何修改?\begin{equation}\left\{\begin{array}{l}u_{t}=\Deltau+|u|^{q-1}u-\frac{1}{m(\Omega)}\int_{\Omega}|u|^{q-1}udx\\\frac{\partial u}{\partial n}=0\end{array}\right.\end{equation}这样之后latex会自动给方程

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