11/6x-11=3.13/56-1.37/56
(11-66x)/6x=(3.13-1.37)/56
(11-66x)/3x=1.76/28
11-66x=5.28x/28
11=(5.28+1848x)/28
308=5.28+1848x
1848x=308-5.28
1848x=302,72
x=302.72/1848
3,5х+ х = 180
4,5х= 180
х=40
3,5х= 140
5\9х+1\6х+75=х
10\18+3\18+75=х
13\18х+75=х
13\18+75\1=13\18+1350\18=1363\18х
х=1363:18
х=75