5x - (x-y)/5 = 11
2y - (x+y)/3 = 11
25x - (x-y) = 55
25x - x + y = 55
24x = 55 - y
x=55/24 - y/24
2y - ((55/24 - y/24) + y)/3 = 11
2y - 55/72 + y/72 - y/3 = 11
144y/72 + y/72 - 24y/72 = 11 + 55/72
121y/72 = 847/72
121y=847
y=7
x=55/24 - 7/24
x= 48/24
x=2
Ответ: x=2; y = 7.