Ответ:

[tex]m = 2 \frac{122}{147} [/tex]

Пошаговое объяснение:

[tex]m \div \frac{26}{5} = \frac{4}{7} \div \frac{21}{20} [/tex]

[tex] \frac{21}{20} m = \frac{4}{7} \times \frac{26}{5} \\ \frac{21}{20} m = \frac{104}{35} \\ m = \frac{104}{35} \div \frac{21}{20} = \frac{104}{35} \times \frac{20}{21} \\ m = \frac{416}{147} = 2 \frac{122}{147} [/tex]