Решим уравнение:
(x - 2)2 = (x - 9)2
x2 - 4x + 4 = x2 - 18x + 81
x2 - 4x + 4 - x2 + 18x - 81 = 0
14x - 77 = 0
14x = 77
x = 77/14
x = 11/2
x = 5.5
Ответ: 5.5