[tex]\bf \begin{cases}
u=\ \textless \ -6,-2\ \textgreater \ \\
-3u=-3\ \textless \ -6,-2\ \textgreater \ \\
\qquad \ \textless \ -3\cdot -6~,~-3\cdot -2\ \textgreater \ \\
\qquad \boxed{\ \textless \ 18~,~6\ \textgreater \ }\\
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v=\ \textless \ -2,3\ \textgreater \ \\
2v=2\ \textless \ -2,3\ \textgreater \ \\
\qquad \ \textless \ 2\cdot -2~,~2\cdot 3\ \textgreater \ \\
\qquad \boxed{\ \textless \ -4~,~6\ \textgreater \ }
\end{cases}\qquad
\begin{cases}
-3u+2v\\
-----------\\
\ \textless \ 18~,~6\ \textgreater \ +\ \textless \ -4~,~6\ \textgreater \ \\\\
\ \textless \ 18-4~,~6+6\ \textgreater \ \\\\
\boxed{\ \textless \ 14~,~12\ \textgreater \ }
\end{cases}[/tex]
