Пошаговое объяснение:

[tex] \frac{1}{2} (x - 1) - \frac{2}{3} x = \frac{1}{3} (x + 3) \: ( \times 6) \\ 3(x - 1) - 4x = 2(x + 3) \\ 3x - 3 - 4x = 2x + 6 \\ 3x - 4x - 2x = 6 + 3 \\ - 3x = 9 \\ x = - 3[/tex]