[tex]7 \frac{2}{3} - (2 \frac{1}{3} - 1 \frac{3}{7} ) \times \frac{7}{19} = 7 \frac{1}{3} [/tex]

[tex]1) \: 2 \frac{1}{3} - 1 \frac{3}{7} = 2 \frac{7}{21} - 1 \frac{9}{21} = 1 \frac{28}{21} - 1 \frac{9}{21} = \frac{19}{21} [/tex]

[tex]2) \: \frac{19}{21} \times \frac{7}{19} = \frac{1}{3} [/tex]

[tex]3) \: 7 \frac{2}{3} - \frac{1}{3} = 7 \frac{1}{3} [/tex]