Răspuns :
a+b=138
a=b+16 =>(b+16)+b=138
2b=138-16
2b=122
b=122:2
b=61 =>a=61+16
a=77
verificare 61+77=138
a=b+16 =>(b+16)+b=138
2b=138-16
2b=122
b=122:2
b=61 =>a=61+16
a=77
verificare 61+77=138