\[\left\{ \begin{matrix} 3u - 2v = 12\ \ | \cdot 3 \\ 4u + 3v = - 1\ \ | \cdot 2 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 9u - 6v = 36\ \ \ \ (1) \\ 8u + 6v = - 2\ \ \ (2) \\ \end{matrix} \right.\ \]
\[17u = 34\]
\[u = 2\]
\[\left\{ \begin{matrix} u = 2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 3u - 2v = 12 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} u = 2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 2v = 3u - 12 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} u = 2\ \ \ \ \ \ \ \ \ \ \ \\ v = \frac{3}{2}u - 6 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} u = 2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ v = \frac{3}{2} \cdot 2 - 6 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} u = 2\ \ \ \\ v = - 3 \\ \end{matrix} \right.\ \]
\[Ответ:( - 3;2).\]