Răspuns :
a + b = 97
a = b + 25
b + 25 + b = 97
2b = 97 - 25
2b = 72
b = 72 : 2
b = 36
a = 36 + 25
a = 61
verificam
36 + 61= 97
a = b + 25
b + 25 + b = 97
2b = 97 - 25
2b = 72
b = 72 : 2
b = 36
a = 36 + 25
a = 61
verificam
36 + 61= 97