(х²-12)/(х²-4) + х/(х-2) = 1,
(х²-12)/(х-2)(х+2) + х/(х-2) = 1,
(х²-12)/(х-2)(х+2) + х(х+2)/(х+2)(х-2) = (х+2)(х-2)/(х+2)(х-2),
(х²-12 + х²+2х)/(х+2)(х-2) = (х²-4)/(х+2)(х-2),
х²-12+х²+2х-х²+4 = 0,
х² + 2х - 8 = 0,
Д = 2² - 4*1*(-8) = 4 + 32 = 36,
х1 = (-2 + 6)/2*1 = 4/2 = 2,
х2 = (-2 - 6)/2*1 = -8/2 = -4,
х+2 ≠ 0, х-2 ≠ 0,
х ≠ -2, х ≠ 2,
ответ: х = -4