# Systeme error: displaying different equation than coded

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.

Code:

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


Error:

Package systeme Error: l'inconnue "x_{-1}" a deja ete trouvee dans l'equation!.
\systeme*{-2x+7 = y, -3x-2x+7-12 = 0}  • isn't it complaining about the two instances of x in the second equation (-3x-2x) – David Carlisle Sep 11 '16 at 15:10 • 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 ## 1 Answer Source of your problem is second equation in your equation systeme. I suspect, that you like to obtain: Correct syntax for above equations is: \documentclass{article} \usepackage{systeme} \begin{document}\systeme*{-2x     + 7 = y,
{-3x -2x} + {7 - 12} = 0}\$
\end{document}