(x-7)^2 = (9-x)^2(x-7)(x-7) = (9-x)(9-x)x^2 - 14x + 49 = 81 - 18x + x^2-14x + 49 = 81 - 18x4x = 32x = 8
Ответ: x = 8
(x-7)^2 = (9-x)^2
(x-7)(x-7) = (9-x)(9-x)
x^2 - 14x + 49 = 81 - 18x + x^2
-14x + 49 = 81 - 18x
4x = 32
x = 8
Ответ: x = 8