[tex] - \frac{7}{9} \div - \frac{21}{5} \\ \\ \frac{7}{9} \times \frac{5}{21} \\ \\ \frac{1}{9} \times \frac{5}{3} \\ \\ \frac{5}{27} [/tex]
Saludos.
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[tex] - \frac{7}{9} \div - \frac{21}{5} \\ \\ \frac{7}{9} \times \frac{5}{21} \\ \\ \frac{1}{9} \times \frac{5}{3} \\ \\ \frac{5}{27} [/tex]
Saludos.