1) х+1/2=2х-3/5+2
5х+5/10=4х-6/10+2
5х+5=4х-6+20
5х-4х=20-6-5
х=9
2) 11-3х/4=х+13/6-х
33-9х/12=2х+26/12-х
33-9х=2х+26-12х
12х-9х-2х=26-33
х=-7
3) 5х+8/9+х=7х+10/6
10х+16/18+х=21х+30/18
10х+16+18х=21х+30
10х+18х-21х=30-16
7х=14
х=2
4) 2(2-3х)/5+1=3-4х/3
4-6х/5+1=3-4х/3
12-18х/15+1=15-20х/15
12-18х+15=15-20х
20х-18х=15-15-12
2х=-12
х=-6