3 3/10 - 5 11/15 =

12 \(\frac{3}{10}\) - 5 \(\frac{11}{15}\) = \(\frac{123}{10}\) - \(\frac{86}{15}\) = \(\frac{369}{30}\) - \(\frac{172}{30}\) = \(\frac{197}{30}\) = 6 \(\frac{17}{30}\)