|2x - 5| - 47 = 1/2 . x
|2x - 5| = 1/2 . x + 47
=> Có 2 TH
TH1: 2x - 5 = 1/2 . x + 47
2x - 1/2 . x = 47 + 5
3/2 . x = 42
=> x = 52 / (3/2) = 52 * 2/3 = 104/3
TH2: 2x - 5 = - (1/2 . x + 47)
2x - 5 = -1/2 . x - 47
2x + 1/2 . x = -47 + 5
5/2 . x = -42
=> x = -42 / (5/2) = -42 * 2/5 = -16,8
Vậy x = 104/3 và x = -16,8