[tex]( \frac{1}{12} + \frac{1}{24} - \frac{1}{36} ) \div ( \frac{1}{4} + \frac{3}{5}) \times 2 \frac{3}{7} = \frac{6 + 3 - 2}{72} \div \frac{5 + 12}{20} \times \frac{17}{7} = \frac{7}{72} \times \frac{20}{17} \times \frac{17}{7} = \frac{7 \times 20 \times 17}{72 \times 17 \times 7} = \frac{20}{72} = \frac{10}{36} = \frac{5}{18} [/tex]
