187:y=14rest5, 187=14y+5(teorema impartirii cu rest)
14y=187-5=182, y=182/14=13
7. a+m+v=708, v=3a, m=a+83, inlocuim v si m in prima ecuatie
a+3a+a+83=708, 5a=708-83=625, a=625/5=125 lei are Andrei
m=125+83=208 lei are Maria, v=3*125=375 lei are Vlad
