Răspuns :
a+b+c=82
a+b=45
b+c=53
c+45=82
c=82-45
c=37
b+37=53
b=53-37
b=16
a+16=45
a=45-16
a=29
v: 29+16+37=82 (a)
a+b=45
b+c=53
c+45=82
c=82-45
c=37
b+37=53
b=53-37
b=16
a+16=45
a=45-16
a=29
v: 29+16+37=82 (a)