7 целых 4/15+(3 целых 1/6-3 целых4/2)

3 1/6  -  3 4/2 = 19/6-10/2=19/6  -  5/1 =(19 × 1  -  5 × 6)/6 = 19/6  -  30/6 =  - 11/6 = - 1 5/6 7 4/15+(-1 5/6) =7 4/15  -  1 5/6 = 109/15  -  11/6 =   (109 × 2  -  11 × 5)/30 = 218/30  -  55/30 =  163/30 = 5 13/30 ответ 5 13/30