( 12 5/13 + y ) - 9 9/13 = 7 7/13
12 5/13 + y = 17 3/13
y = 17 3/13 - 12 5/13
y = 16 16/13 - 12 5/13
y = 4 11/13
ответ: 4 11/13
( 12 5/13 + y ) - 9 9/13 = 7 7/13
12 5/13 + y = 17 3/13
y = 17 3/13 - 12 5/13
y = 16 16/13 - 12 5/13
y = 4 11/13
ответ: 4 11/13