15/64х = 25
х = 25 : 15/64
х = 320/3
х = 106 2/3
-------------------------
5 1/3 х = 8 8/9
х = 8 8/9 : 5 1/3
х = 80/9 : 16/3
х = 5/3 = 1 2/3
-------------------------
3 2/5у = 6 4/5
17/5у = 34/5
у = 34/5 : 17/5
у = 2
------------------------
9 1/2у = 14 1/4
19/2у = 57/4
у = 57/4 : 19/2
у = 3/2 = 1 1/2