How would I do something like this :

=      < Justification >
    x + y + a
=      < according to ... >

Which math environment should I use get this kind of equations? And how can I display 2 such blocks side by side?


I would do it like this (this saves space too).

  \begin{alignedat} {4}
    f(x) &= x + y + a & \qquad &  \text{(You say it)}\\
         &= abc       & \qquad &  \text{(According to me)}

enter image description here

  • amsmath is enough and the second \qquad isn't needed. – Svend Tveskæg Feb 20 '14 at 2:46
  • @SvendTveskæg Well, I always use mathtools (habit) and use of \qquad is always subjective. Anyway, thanks for the comment. – user11232 Feb 20 '14 at 6:38

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