\[\left\{ \begin{matrix} 5x + 6y = - 4 \\ 3x - 6y = 12\ \\ \end{matrix}\text{\ \ } \right.\ ( + )\]
\[\text{\ \ \ \ \ \ \ }\overline{\ \ \ 8x = 8\ \ \ \ \ \ \ \ \ \ \ \ }\]
\[\ \ \ \ \ \ \ \ \ \ \ \ x = 1\]
\[\left\{ \begin{matrix} x = 1\ \ \ \ \ \ \ \ \ \ \\ 5 + 4 = 6y \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} x = 1\ \ \ \ \\ y = 1,5 \\ \end{matrix} \right.\ \]
\[Ответ:(1;1,5).\]