3x=y * 2,(4)
=> 3x= y* 22/9
3x=22y/9
=> x=22y/9/3
x=22y * 3/9
x=66y/9
(x+y)/2=263
=> (66y/9+y)/2=263
Amplificam y-ul la 9
=> (66y/9 + 9y/9)/2=263
(75y/9)/2=263
75y * 2/9=263
150y/9=263
=> 150y=2367
=> y=2367/150=15,78
Sper ca te-am ajutat! Coronita pls!