Как решить 3 4/15+y=1 11/15. 5 4/13-x=4 5/13.

3 4/15+y=1 11/15.
 49/15 +y = 26/15
 y = 26/15 -49/15 = -23/15 = - 1 8/15
y = - 1 8/15         

 5 4/13-x=4 5/13.
x = 5 4/13 - 4 5/13 = 4 17/13 - 4 5/13 = 17/13 -5/13 =12/13
x = 12/13 

У=1 11/15-3 4/15
у= -1 8/15

х=5 4/13-4 5/13
х=12/13