# subequations and array in braces

I need something like this:

\left\{
first line  (1a)
second line (1b)
third line  (1c)
\right.


all lines should be aligned to left

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Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. –  Marco Daniel Mar 15 '14 at 12:43
–  Marco Daniel Mar 15 '14 at 12:43

Two solutions: one with the empheq package and an align environment, another with the subnumcases environment from the cases package. I had to adjust spacing for the brace in both, as I found the default was not so good (too small in the first case, too large in the second):

    \documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage{cases}

\begin{document}

\begin{subequations}
\begin{align}[left = \empheqlbrace\,]
& a = b \\
& c = d
\end{align}
\end{subequations}

\begin{subnumcases}{}
\!\! a = b \\
\!\! c = d
\end{subnumcases}

\end{document}


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