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I want to align several equations in latex.

I want the first and second equations to be in the middle.

The last equation is too long and I want to split it into 2 parts.

I tried

\begin{gather}

Eq1\\

Eq2\\

\begin{multline}

Eq3a\\

Eq3b

\end{multline}

\end{gather}

However, the code cannot be compiled due to multline cannot be used inside other environment. How can I solve the problem?

Thanks for your help very much.

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# Latex alignment

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