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Thank You very much, it is exactly what I need.

Hello,

I want to have numbered every line in \begin{cases} so I can later refer to it. I have tried sth like this:
\begin{equation}
A = \begin{cases}
B \\
C
\end{cases}
\end{equation}
and this
\begin{equation}
A = \left\{
\begin{array}{l}
B \\
C
\end{array}\right.
\end{equation}
but I have ...