Pertidaksamaan 2x + 7/x-1 <1

= 2x + 7 < x - 1
= x < -8

(2x + 7)/(x - 1) < 1
(2x + 7)/(x - 1) - 1 < 0
(2x + 7 - (x - 1))/(x - 1) < 0
(2x + 7 - x + 1) / (x - 1) < 0
(x + 8)/(x - 1) < 0
x = -8 atau x = 1
Garis bilangan
+++ (-8) --- (1) +++
-8 < x < 1