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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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1 Answer 1

up vote 4 down vote accepted

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[overload]{empheq}
    \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} 

enter image description here

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