\[\boxed{\text{389.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[y^{2} + 4y - 4 - 4y = 0\]
\[y^{2} - 4 = 0\]
\[y^{2} = 4\]
\[y = \pm 2.\]
\[\left\{ \begin{matrix} y = 2 \\ x = 2 \\ \end{matrix} \right.\ \ \ \ \ \ или\ \ \ \ \left\{ \begin{matrix} y = - 2 \\ x = - 6 \\ \end{matrix} \right.\ \]
\[Ответ:(2;2);\ \ ( - 6; - 2).\]
\[x^{2} + x - 2x^{2} + 1 - 4x + 4x^{2} - 7 = 0\]
\[3x^{2} - 3x - 6 = 0\ \ \ \ \ |\ :3\]
\[x^{2} - x - 2 = 0\]
\[x_{1} + x_{2} = 1;\ \ \ \ x_{1} \cdot x_{2} = - 2\]
\[x_{1} = 2;\ \ \ \ x_{2} = - 1.\]
\[\left\{ \begin{matrix} x = - 1 \\ y = 3\ \ \ \\ \end{matrix} \right.\ \ \ \ или\ \ \ \left\{ \begin{matrix} x = 2\ \ \\ y = - 3 \\ \end{matrix} \right.\ \]
\[Ответ:( - 1;3);\ \ (2; - 3).\]