[tex]2 \frac{1}{3} - \frac{2}{3} = \frac{7}{3} - \frac{2}{3} = \frac{5}{3} = 1 \frac{2}{3} [/tex]
[tex]3 \frac{2}{7} - \frac{5}{7} = \frac{23}{7} - \frac{5}{7} = \frac{18}{7} [/tex]
[tex]1 \frac{2}{5} - \frac{4}{5} = \frac{7}{5} - \frac{4}{5} = \frac{3}{5} [/tex]
