1)4х-20=0
4х=20
х=20/4
х=5
2)3х-5=4х+1
3х-4х=1+5
-х=6
х=-6
3)2(х+7)=9-2х
2х+14=9-2х
2х+2х=9-14
4х=-5
х=-5/4
х=-1,25
1)4х-20=0
4х=20
х=20/4
х=5
2)3х-5=4х+1
3х-4х=1+5
-х=6
х=-6
3)2(х+7)=9-2х
2х+14=9-2х
2х+2х=9-14
4х=-5
х=-5/4
х=-1,25