a + b = 26 * 2 a + b = 52
b + c = 34 * 2 b + c = 68
a + c = 30 * 2 a + c = 60
le adunam
2 * (a + b + c) = 180
a + b + c = 180 : 2
a + b + c = 90
a + b = 52
a + c = 60
le scadem
c - b = 8
b + c = 68
le adunam
2c = 76
c = 76 : 2 c = 38
b = 68 - 38 b = 30
a = 52 - 30 a = 22