Răspuns :
a + b + c = 969
b = a + 2
c = a + 4
a + a + 2 + a + 4 = 969 / - 6
3a = 963
a = 963 : 3
a = 321
b = 321 + 2
b = 323
c = 321 + 4
c = 325
b = a + 2
c = a + 4
a + a + 2 + a + 4 = 969 / - 6
3a = 963
a = 963 : 3
a = 321
b = 321 + 2
b = 323
c = 321 + 4
c = 325