3х дробь х-1 - х+1 дробь х-1

Решите задачу:

$1) \frac{3x - 7}{x - 1} - \frac{x + 1 }{x - 1} = 0 \\ 2x - 8 = 0 \\ x = 4 \\ 2) \frac{x}{x + 5} - \frac{25}{x + 5x} = 0 \\ \frac{x(x + 5x) - 25(x + 5)}{(x + 5)(x + 5x)} = 0 \\ {x}^{2} + 5 {x}^{2} - 25x - 125 = 0 \\ 6 {x}^{2} - 25x - 125 = 0 \\ x = \frac{25 + - \sqrt{625 - 4 \times 6 \times - 125} }{2 \times 6} \\ x = \frac{25 + - \sqrt{3625} }{12} \\ x1 = \frac{25 + \sqrt{3625} }{12} \\ x2 = \frac{25 - \sqrt{3625} }{12}$