Tentukan nilai x yang memenuhi persamaan |2x -1| = 7

|2x - 1| = 7
2x - 1 = 7
2x = 7 + 1
2x = 8
x = 4
2x - 1 = -7
2x = -7 + 1
2x = -6
x = -3
HP = {-3, 4}

|2x-1|=7
2x-1=7
2x=8
x=4
........

Maaf ya kalau salah....