Răspuns :
| 2x - 5 | - 5 =8 | 2x - 5 | - 5 = - 8
I 2x - 5 I = 8 + 5 I 2x - 5I = - 8 - 5
| 2x - 5 | = 13 | 2x - 5 | = - 3 nu are solutie
2x- 5 = 13 2x - 5 = - 13
2x = 18 2x = - 8
x = 18 : 9 x = - 8 : 2
x = 9 x = - 4
S = { - 4 ; 9 }
| 2x - 5 | - 5 =8 | 2x - 5 | - 5 = - 8
I 2x - 5 I = 8 + 5 I 2x - 5I = - 8 - 5
| 2x - 5 | = 13 | 2x - 5 | = - 3 nu are solutie
2x- 5 = 13 2x - 5 = - 13
2x = 18 2x = - 8
x = 18 : 9 x = - 8 : 2
x = 9 x = - 4
S = { - 4 ; 9 }