Tìm x trong phương trình có phân số

a) \(2x + \frac{1}{2} = \frac{7}{9}\) \(2x = \frac{7}{9} - \frac{1}{2}\) \(2x = \frac{14}{18} - \frac{9}{18}\) \(2x = \frac{5}{18}\) \(x = \frac{5}{18} : 2 = \frac{5}{18} \cdot \frac{1}{2} = \frac{5}{36}\) Vậy \(x = \frac{5}{36}\). b) \(\frac{3}{4} - 6x = \frac{7}{13}\) \(6x = \frac{3}{4} - \frac{7}{13}\) \(6x = \frac{39}{52} - \frac{28}{52}\) \(6x = \frac{11}{52}\) \(x = \frac{11}{52} : 6 = \frac{11}{52} \cdot \frac{1}{6} = \frac{11}{312}\) Vậy \(x = \frac{11}{312}\).