(x+1 1/3)(x-2)=(x-1 1/3)(x+1)

(x +11/3)(x-2) = (x - 11/3)(x+1)
Раскроем скобки:
x^2 -2x + 11/3 x - 2*11/3 = x^2 + x - 11/3 x - 11/3
x^2 - x^2 - 2x -x + 11/3 x + 11/3 x - 2*11/3 + 11/3 = 0
-3x +2*11/3 x +11/3 - 22/3 = 0
22/3 x - 3x - 11/3 = 0
x(22/3 - 9/3) = 11/3
x * 13/3 = 11/3
x = 11/3 * 3/13 = 11/13