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I use the following:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation} \label{eq:solve}
x^2 - 5 x + 6 = 0
\end{equation}

\begin{equation}
x_1 = \frac{5 + \sqrt{25 - 4 \times 6}}{2} = 3
\end{equation}

\begin{equation}
x_2 = \frac{5 - \sqrt{25 - 4 \times 6}}{2} = 2
\end{equation}
\end{document}

to display:

enter image description here

How can I add an brace with a text on the right of the equation numbering? Like the following:

enter image description here

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1  
Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. –  Christian Hupfer Jun 17 at 21:36
    
@ChristianHupfer Good idea, thanks! –  Franck Dernoncourt Jun 17 at 21:43
    
Accolade is mainly a "false friend". The correct English word is "brace" –  Jubobs Jun 17 at 22:35

1 Answer 1

up vote 12 down vote accepted

This is one way:

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\[
\begin{drcases*}
\begin{minipage}{0.7\textwidth}
\begin{equation} \label{eq:solve}
x^2 - 5 x + 6 = 0
\end{equation}    
\begin{equation}
x_1 = \frac{5 + \sqrt{25 - 4 \times 6}}{2} = 3
\end{equation}
% don't leave blank line    
\begin{equation}
x_2 = \frac{5 - \sqrt{25 - 4 \times 6}}{2} = 2
\end{equation}
\end{minipage}
\end{drcases*}
\text{bla bla bla}
\]
\end{document}

enter image description here

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1  
+1 for introducing me drcases. –  Sigur Jun 17 at 22:43

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