Question

Помогите ребят срочно 20баллов даю​

Answer 1

на фото..............

Answer 2

$\frac{9}{9 - x} + 9 - x = - 6 \\ \frac{9 + 9(9 - x) - x(9 - x)}{9 - x} + 6 = 0 \\ \frac{9 + 81 - 9x - 9x + {x}^{2} + 6(9 - x) }{9 - x} = 0 \\ 90 - 18x + {x}^{2} + 54 - 6x = 0 \\ {x}^{2} - 24x + 144 = 0 \\ d = 12^{2} - 144 = 0 \\ x = 12$