\documentclass{report}
\usepackage{mathtools}
\usepackage{systeme}
\usepackage{multicol}
\usepackage{xepersian}
\makeatletter
\@ifundefined{Umathcode}{\let\Umathcode\XeTeXmathcode}{}
\@ifundefined{Umathchardef}{\let\Umathchardef\XeTeXmathchardef}{}
\makeatother

\begin{document}

\begin{center}
\begin{tabular}{rp{1.5cm}r}
\sysdelim..\systeme{x+y+3z=5\quad . 1,2x-y+4z=11,-y+z=3.} &&
\sysdelim..\systeme[xyzu]{3x-2y+5z+u=1\quad . 5,x+y-3z+2u=2,6x+y-4z+3u=7.} \\
&&\\
\sysdelim..\systeme{3x+2y+z=1\quad . 2,5x+3y+3z=2,x+y-z=1.} &&
\sysdelim..\systeme[xyzu]{x+y-3z+u=5\quad . 6,2x-y+z-2u=2,7x+y-7z+3u=3.} \\
&&\\
\sysdelim..\systeme{3x+2y+z=1\quad . 3,5x+3y+3z=2,7x+4y+5z=3.} &&
\sysdelim..\systeme[xyzuv]{x+y+2z+3u+4v=0\quad . 7,2x+2y+7z+11u+14v=0,3x+3y+6z+10u+15v=0.} \\
&&\\
\sysdelim..\systeme{3x+2y+z=1\quad . 4,5x+3y+3z=2,7x+4y+5z=3,x+y-z=0.} &&
\sysdelim..\systeme[xyzu]{x-2y+z+2u=-2\quad . 8,2x+3y-z-5u=9,4x-y+z-u={}5,5x-3y+2z+u={}3.} \\
\end{tabular}
\end{center}

\end{document}