x + y = 105
2/3x = 1/2y
2x/3 = y/2 ( Aducem la acelasi numitor )
4x/6 = 3y/6 l inmultim totul cu 6
4x = 3y
x = 3y/4
3y/4 + y = 105 ( aducem la acelasi numitor )
3y/4 + 4y/4 = 420/4 l inmultim totul cu 4
3y + 4y = 420
7 y = 420
y = 420/7
y = 60
x = 105 - 60
x = 45
verificam
2/3x = 1/2y
(2x45)/3 = 60/2
90/3 = 60/2
30=30 adevarat
