Răspuns :
a-b=24
a-13=24
a=24+13=37
37-13=24(verificare)
a-b=13
39-b=13
b=39-13=26
39-26=13(verificare)
a-13=24
a=24+13=37
37-13=24(verificare)
a-b=13
39-b=13
b=39-13=26
39-26=13(verificare)