10 5/8 - х = 7 3/5
х = 10 5/8 - 7 3/5
х = 10 25/40 - 7 24/40
х = 3 1/40
(х - 2 7/8) + 3 5/6 = 4 2/3
х - 2 7/8 = 4 2/3 - 3 5/6
х - 2 7/8 = 4 8/12 - 3 10/12
х - 2 7/8 = 3 20/12 - 3 10/12
х - 2 7/8 = 10/12 = 5/6
х = 5/6 + 2 7/8
х = 20/24 + 2 21/24
х = 2 41/24
х = 3 17/24