2/(x² - 1) + 1/(x + 1) = -1/3

2/(x² - 1) + 1/(x + 1) = -1/3

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

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

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

3 = -1(x - 1)

3 = -1x + 1

x = 1 - 3

x = -2