nilai x yang memenuhi persamaan 4 I 3-x I = 20

4|3 - x| = 20
|3 - x| = 20/4
|3 - x| = 5

1) 3 - x = 5
=> -x = 5 - 3
=> -x = 2
=> x = -2

2) 3 - x = -5
=> -x = -5 - 3
=> -x = -8
=> x = 8

HP = {-2, 8}