1.
а.2х-3=4
2х=4+3
2х=7
х=7:2
х=3,5
б.6х-2х+1=5
4х=5-1
4х=4
х=4:4
х=1
в.5- 2/5х=11
-2/5х=11-5
-2/5х=6
х=6: -2/5
х= 6: -5/2
х=-15
2.4х+13=57
4х=57-13
4х=44
х=11
4.5*1,2-1=6-1=5
5.Зх-5-7х-3=-4х-8
