Răspuns :
a+b=123
a:b= 7 r=3
a=7b+3
7b+3+b=123
8b+3=123
8b=123-3
8b=120
b=120/8
b=15
a=7*15+3
a=108
a:b= 7 r=3
a=7b+3
7b+3+b=123
8b+3=123
8b=123-3
8b=120
b=120/8
b=15
a=7*15+3
a=108
x + y = 123
x = 7y + 3
7y + 3 + y = 123
8y = 123 - 3
8y = 120
y = 120 :8 = 15
x= 7 ·15 + 3 = 105 + 3 =108
x = 7y + 3
7y + 3 + y = 123
8y = 123 - 3
8y = 120
y = 120 :8 = 15
x= 7 ·15 + 3 = 105 + 3 =108