17/9: 2 2/3 3 3/5: 2 1/10 3 3/8 1/8 - 1 5/14 x 7 и уравнение 1/7x + 3/14 - x = 14

1) 16/9: 8/3 = 16/9 ·3/8 = 2/3.
2)18/5 : 21/10 = 18/5·10/21 = 12/7.
3) 3  3/8  - 19/14 · 7/1=3 3/8 - 19/2 = 3 3/8 - 9 1/2 = 3 3/8 - 9 4/8 = - 6  1/8.
4) 1/7х - х = 14 - 3/14,
    - 6/7 х = 13 11/14.
       х = 13  11/14: (- 6/7)
       х = - 193/12= - 16  1/12