Tìm x biết 1) \( x + \frac{1}{3} = \frac{2}{5} \left( -\frac{1}{3} \right) \). 2) \( | 1 - x | - \frac{9}{25} = \left( \frac{4}{5} \right)^2 \) 3) \( \frac{2 - x}{4} = \frac{3x - 1}{3} \)