Реши уравнения

1. \((x-2)(x+2)-(x-3)^2=-25\) ;

   \(x^2-4-x^2+6x-9=-25\) ;

   \(6x~-\) [ ] \(=-25\) ;

   \(6x=\) [ ];

   \(x=\) [ ].

2. \((y-4)(y+4)-(y+9)^2=-7\) .

Ответ:

1. \(x=\) [ ].
2. \(y=\) [ ].