| 2x-3 | + | x+1 | < 9

| 2x-3 | + | x+1 | < 9
|-6|+|x+1| <9
6+|x+1| <9
|x+1| <9-6
|x+1| <3
x+1 <3, x+1 > sama dengan 0
- (x+1) <3 x + 1 < 0
x <2, x> sama dengan-1
x>-4, x <-1
x € [-1, 2)
x€ (-4,-1)
x€ (-4, 2)