(к - 5 3/14) + 8 13/14= 15 - 3 9/14
(к/ - 5 3/14) + 8 13/14= 14 14/14 - 3 9/14
(к - 5 3/14) + 8 13/14= 11 5/14
к - 5 3/14= 11 5/14 - 8 13/14
к - 5 3/14= 10 19/14 - 8 13/14
к - 5 3/14= 2 6/14
к=5 3/14+ 2 6/14
к=7 9/14
12 7/23 - (6 18/23-t)=3 21/23+5 19/23
12 7/23 - (6 18/23-t)=8 40/23
- (6 18/23-t)=9 17/23 - 12 7/23
- 6 18/23+t=9 17/23 - 11 30/23
- 6 18/23+t= - 2 13/23
t=- 2 13/23 + 6 18/23
t=4 5/23