Tìm số hữu tỉ x, biết:

a)Tìm số hữu tỉ \(x\), biết: \(x - \frac{2}{3} = 2\frac{1}{3}\);

 \(\begin{array}{l}x - \frac{2}{3} = \frac{7}{3}\\x = \frac{7}{3} + \frac{2}{3}\\x = 3\end{array}\)

b) \(\frac{3}{2} - \frac{2}{9}x = \frac{1}{3}\).

 \(\begin{array}{l} - \frac{2}{9}x = \frac{3}{2} - \frac{1}{3}\\ - \frac{2}{9}x = \frac{7}{6}\\x = \frac{7}{6}:\frac{{ - 2}}{9}\\x = \frac{7}{6}.\frac{{ - 9}}{2}\\x = \frac{{ - 21}}{4}\end{array}\)