7 7/15 - 1 3/20 =

7 \(\frac{7}{15}\) - 1 \(\frac{3}{20}\) = \(\frac{112}{15}\) - \(\frac{23}{20}\) = \(\frac{448}{60}\) - \(\frac{69}{60}\) = \(\frac{379}{60}\) = 6 \(\frac{19}{60}\)