/usr/share/texlive/texmf-dist/tex/generic/systeme/systeme.sty is in texlive-generic-extra 2013.20140215-2.
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1 2 3 4 | \RequirePackage{xstring}
\input systeme.tex
\ProvidesPackage\SYS@packagename[\SYS@date\space v\SYS@ver\space Mise en forme de systemes d'equations]
\endinput
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