1) 1/2х+1/3х+1/4Х=26/27,
6/12х+4/12х+3/12х=26/27
13/12х=26/27, х= 26/27: 13/12
х=24/27
2) 2 1/3х-2 3/5=1 2/15
7/3х=17/15+13/5,
7/3х=17/15+39/15
7/3х=56/15,
х= 56/15:7/3
х=8/5=1 3/5
3) 4 5/12-5 3/5х= 2 2/3
-28/5х=8/3-53/12
28/5х=53/12-32/12
28/5х=21/12
х=21/12:28/5
х= 5/16
4) 5/18х+2 1/2= 10 5/6
5/18х=65/6-5/2
5/18х=65/6-15/6
5/18х=50/6=25/3
х=25/3:5/18,
х=30