nilai mutlak

|x| < a → -a < x < a

•

|14 – 2x| < 4

-4 < 14 – 2x < 4

-4 – 14 < 14 – 2x – 14 < 4 – 14

-18 < -2x < -10

-18/-2 > -2x/-2 > -10/-2

9 > x > 5

5 < x < 9

HP = {x| 5 < x < 9, x ∈ R}