(3 5/14 + x) - 1 4/7 = 4 15/28
(47/14 + x) - 11/7 = 127/28
47/14 + x - 11/7 = 127/28
25/14 + x = 127/28
x = 127/28 - 25/14
x = 11/4
(3 5/14 + x) - 1 4/7 = 4 15/28
(47/14 + x) - 11/7 = 127/28
47/14 + x - 11/7 = 127/28
25/14 + x = 127/28
x = 127/28 - 25/14
x = 11/4