[tex] x + y = 50 \\ x = \frac{2}{3} y \\ \\ \\ \frac{2}{3} y + y = 50 \\ \\ \frac{2y}{3} + \frac{3y}{3} = 50 \\ \\ \frac{5y}{3} = 50 \\ \\ 5y = 50 \times 3 \\ 5y = 150 \\ y = \frac{150}{5} \\ y = 30 \\ \\ \\ x + y = 50 \\ x + 30 = 50 \\ x = 50 - 30 \\ x = 20[/tex]
Te rog coroană <3
