victor +alin = 48
victor -10 alune si alin +10 alune
alin = victor +30
victor + 30+ victor=48 ( am inlocuit in prima relatie)
inseamna ca victor ×2 = 48-10
victor ×2 = 18
victor = 18÷2 = 9
iar alin are 30 + 9 = 39
asta a fost dupa ce au facut schimbul de alune
la inceput au avut alin = 39-10 = 29
iar victor 9+ 10 = 19