Х+9 7/10=28 2/15
х=28 2/15 - 9 7/10
х=28 4/30 - 9 21/30
х=18 13/30
11 3/4 - у=5 15/34
у=11 3/4 - 5 15/34
у=11 51/64 - 5 30/64
у=6 21/64
7 27/44 +а=18 51/55
а=18 51/55 - 7 27/44
а=18 204/220 - 7 135/220
а=11 69/220
6 3/11 +b=11 93/121
b=11 93/121 - 6 3/11
b=11 93/121 - 6 33/121
b=5 60/121
9 5/36 - x=2 4/9
x=9 5/36 - 2 16/36
x=6 25/36
k - 5 17/60=7 9/20
k=7 9/20 - 5 17/60
k=7 27/60 - 5 17/60
k=2 10/60
k=2 1/6