When I enter the following line of code in LaTeX for displaying a system I get a strange error. And yes, I don't know why it is in French.


$\systeme*{-2x+7 = y, -3x-2x+7-12 = 0}$


Package systeme Error: l'inconnue "x_{-1}" a deja ete trouvee dans l'equation!.
$\systeme*{-2x+7 = y, -3x-2x+7-12 = 0}
  • 1
    isn't it complaining about the two instances of x in the second equation (-3x-2x) – David Carlisle Sep 11 '16 at 15:10
  • 1
    systeme is great for typesetting linear systems in canonical form. When the form is not the canonical one, there's no sensible alignment to do. – egreg Sep 11 '16 at 15:15
  • The package author is French. Maybe he forgot to translate some of the error messages. – Bernard Sep 11 '16 at 17:32

Source of your problem is second equation in your equation systeme. I suspect, that you like to obtain:

enter image description here

Correct syntax for above equations is:


$\systeme*{-2x     + 7 = y,
          {-3x -2x} + {7 - 12} = 0}$         

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