X-4 10 4
----- - -------- = ----
x+1 x^2-1 9
x-4 10 4
----- - --------- = ----, x не = -1, х не = 1
x+1 x^2-1 9
х-4 10 4
----- - -------------- = ----
х+1 (х-1)×(х+1) 9
х^2-4х-х+4-10 4
-------------------- = -----
(х-1)×(х+1) 9
х^2+х-6х-6 4
---------------- = ------
(х-1)×(х+1) 9
х-6 4
----- = ----
х-1 9
9 (х-6)=4 (х-1)
9х-54=4х-4
9х-4х= -4+54
5х=50
х=10, х не = -1, х не= 1
х=10