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Consider the following example:

    &a+b=c, \\

enter image description here

Is there a way to set up two equation tags, one per line in the aligned environment?

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2 Answers 2

up vote 5 down vote accepted

You can do this by using the empheq package from the mh bundle. See code below for an example.

\usepackage{mathtools}       % loads »amsmath«

    a+b &= c \\
    x &= y+z

enter image description here

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Just a different way of obtaining the same result:

enter image description here

\usepackage{amsmath}% http://ctan.org/pkg/amsmath
    a+b &= c, \\
  x &= y+z.

The key here is to set the "left-hand side" separately from the "right-hand side" and align the two using some vertical movement.

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Note that this works great only if the two lines have "usual" height; e.g., it breaks if they contain fractions. –  Hendrik Vogt Oct 13 '12 at 6:47

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