Răspuns :
a-b=41
a+b=129
a=41+b
(41+b)+b=129
41=129-2b
129-41=2b
88=2b
b=44
a=41+44=85
a+b=44+85=129
a-b=85-44=41
a+b=129
a=41+b
(41+b)+b=129
41=129-2b
129-41=2b
88=2b
b=44
a=41+44=85
a+b=44+85=129
a-b=85-44=41