x = -2
Объяснение:
x(x-2) - (x+5)^2 = -1
x^2 - 2x - (x^2 + 10x + 25) = -1
x^2 - 2x - x^2 - 10x - 25 = -1
-12x - 25 = -1
-12x = 24