6х+7=4х-1
6х-4х=-1-7
2х=-8
х=-8:2
х=-4
6(4х+3)=5х-1
24х+18=5х-1
24х-5х=-1-18
-19х=-19
х=-19:(-19)
х=1
6(2х+1)+2х=5х-12
12х+6+2х=5х-12
12х+2х-5х=-12-6
9х=-18
х=-18:9
х=-2
3(5х-2)-7(3х+4)=-24
15х-6-21х-28=-24
15х-21х=-24+6+28
-6х=10
х=110:(-6)
х=-10\6
х=-1 4\6
х=-1 2\3
7х-7(4х-1)=1-3(5х-2)
7х-28х+7=1-15х+6
7х-28х+15х=1+6-7
-6х=0
х=0 нет решений
4,8(х-3)+1=2,4(2х+3)
4.8х-14.4+1=4.8х+7.2
4.8х-4.8х=7.2+14.4-1
0=20.6 нет решений