[tex]1 \frac{4}{5} \div ( \frac{3}{4} \times \frac{8}{21} + 1) - \frac{4}{9} [/tex]
[tex] \frac{9}{5} \div ( \frac{2}{7} + 1) - \frac{4}{9} [/tex]
[tex] \frac{9}{5} \times \frac{9}{7} - \frac{4}{9} [/tex]
[tex] \frac{1}{5} \times 7 - \frac{4}{9} [/tex]
[tex] \frac{7}{5} - \frac{4}{9} [/tex]
[tex] \frac{43}{45} [/tex]
[tex] \frac{9}{5} \times \frac{7}{9} - \frac{4}{9} [/tex]
