Question

Помогите пожалуйста

Answer 1

$\frac{14}{ {x}^{2} - 49 } + \frac{x}{x + 7} = 1 \\ \frac{14}{(x - 7)(x + 7)} + \frac{x}{x + 7} = 1 \\ 14 + x(x - 7) = (x - 7)(x + 7) \\ 14 + {x}^{2} - 7x = {x}^{2} - 49 \\ 7x = 63 \\ x = 9$

$\frac{x}{x + 9} - \frac{81}{ {x}^{2} + 9x } = 0 \\ \frac{x}{x + 9} - \frac{81}{x(x + 9)} = 0 \\ {x}^{2} - 81 = 0 \\ {x}^{2} = 81 \\ x =9$