Răspuns :
a+b=77
a=b+7
inlocuim
b+7+b=77
2b+7=77
2b=77-7
2b=70
b=70:2
b=35
a=77-b => a=77-35 => a=42
42+35=77
scz daca am scris ceva gresit
a+b=77
a=b+7
inlocuim
b+7+b=77
2b+7=77
2b=77-7
2b=70
b=70:2
b=35
a=77-b => a=77-35 => a=42
42+35=77
scz daca am scris ceva gresit