Răspuns :
a+b+c=789
a+b=666
666+c=789
c=789-666
c=123
a+b+c=789
b+c=355
a+355=789
a=434
a+b+c=789
434+b+123=789
b=789-434-123
b=232
a+b=666
666+c=789
c=789-666
c=123
a+b+c=789
b+c=355
a+355=789
a=434
a+b+c=789
434+b+123=789
b=789-434-123
b=232