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I am working on a report. One of that is to requote many equations from paper. I often use:

\begin{align*}\tag{5}
x = a + b
\end{align*}

This works fine for a single equation. However, is there any way to tag many equations in a single \align*, instead of working manually like:

\begin{align*}\tag{5}
x = a + b
\end{align*}
\begin{align*}\tag{10}
y = c + d
\end{align*}

Thank you

3

First and foremost: don't use align for single equations.

Second: align is for multiline displays.

\begin{align}
x &= a+b \tag{*} \\
y &= c+d \tag{**}
\end{align}

You say you have to repeat equations. Then you shouldn't use an explicit number.

%%% in section 1
\begin{equation}\label{important}
x=a+b
\end{equation}

%%% in section 3
\begin{equation}\tag{\ref{important}}
x=a+b
\end{equation}

The same with align.

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