Risolvi la seguente espressione

$$\left(\frac{7}{15}-\frac{1}{10}\right)\times\frac{42}{55}$$

$$\left(\frac{14-3}{30}\right)\times\frac{42}{55}=$$

$$\frac{11}{30}\times\frac{42}{55}=$$

$$\frac{11}{55}\times\frac{42}{30}=$$

$$\frac{1}{5}\times\frac{21}{15}=$$

$$\frac{21}{75}$$

$$\frac{7}{25}$$