\[x^{2} - y^{2} = 7\]
\[(x - y)(x + y) = 7\]
\[1)\ x + y = \pm 1;\ \ \ \ x - y = \pm 7\]
\[x = \pm 4;\ \ y = \pm 3.\]
\[2)\ x + y = \pm 7;\ \ x - y = \pm 1\]
\[x = \pm 4;\ \ y = \pm 3.\]
\[Ответ:\ \ (4;\ - 3);( - 4;3);(4;3);\]
\[( - 4;\ - 3).\]