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-\frac{4}{9}+\frac{2}{3}\left(-\frac{5}{7}\right)^{-1}
Resteu \frac{2}{7} de 1 per obtenir -\frac{5}{7}.
-\frac{4}{9}+\frac{2}{3}\left(-\frac{7}{5}\right)
Calculeu -\frac{5}{7} elevat a -1 per obtenir -\frac{7}{5}.
-\frac{4}{9}-\frac{14}{15}
Multipliqueu \frac{2}{3} per -\frac{7}{5} per obtenir -\frac{14}{15}.
-\frac{62}{45}
Resteu -\frac{4}{9} de \frac{14}{15} per obtenir -\frac{62}{45}.