1)
х - 3 9/13 = 12 4/13 - 5 10/13
х - 3 9/13 = 11 17/13 - 5 10/13
х - 3/913 = 6 7/13
х = 6 7/13 + 3 9/13
х = 9 16/13
Ответ: х = 10 3/13
2)
3 9/16 - у = 5 7/16 - 4 9/16
3 9/16 - y = 4 23/16 - 4 9/16
3 9/16 - y = 14/16
y = 3 9/16 - 14/16
y = 2 25/16 - 14/16
y = 2 11/16
Ответ: y = 2 11/16