[tex] \frac{5}{2} \times ( \frac{1}{5} \times ( \frac{2}{3} + x) - \frac{4}{3} ) = 10 \\ \frac{1}{5} \times ( \frac{2}{3} + x) - \frac{4}{3} = 10 \times \frac{2}{5} \\ \frac{1}{5} \times ( \frac{2}{3} + x) - \frac{4}{3} = 4 \\ \frac{1}{5} \times ( \frac{2}{3} + x) = 4 + \frac{4}{3} \\ \frac{1}{5} \times ( \frac{2}{3} + x) = \frac{16}{3} \\ \frac{2}{3} + x = \frac{16}{3} \times 5 \\ \frac{2}{3} + x = \frac{80}{3} \\ x = \frac{80}{3} - \frac{2}{3} = \frac{78}{3} = 26.[/tex]
