13целых 2/5+(-3целых 7/15)

13 2/5 + ( - 3 7/15 ) = 13 6/15 - 3 7/15 = 12 21/15 - 3 7/15 = 9 14/15

[latex]13 \frac{2}{5}+(-3 \frac{7}{15})= \frac{67}{5} -3 \frac{7}{15}= \frac{67}{5} - \frac{52}{15} = \frac{201-52}{15}= \frac{149}{15} =9 \frac{14}{15} [/latex]