[tex](3 \frac{1}{9} \div 3 \frac{4}{9} + \frac{3}{31} ) \div \frac{1}{4} - 3 \frac{2}{7} = ( \frac{28}{9} \times \frac{1}{ 3} \times \frac{4}{9} + \frac{3}{31} ) \times 4 - \frac{23}{7} = ( \frac{112}{243} + \frac{3}{31} ) \times 4 - \frac{23}{7} = \frac{4201}{7533} \times 4 - \frac{23}{7} = \frac{16804}{7533} - \frac{23}{7} = - \frac{55631}{52731} [/tex]
