на фото...
______________________________
3х-6=х+2
3х-х=2+6
2х=8
х=4
8х-8=20-6х
8х+6х=20+8
14х=28
х=2
5(x-4)=x+8
5х-20=х+8
4х=28
х=7
на фото...
______________________________
3х-6=х+2
3х-х=2+6
2х=8
х=4
8х-8=20-6х
8х+6х=20+8
14х=28
х=2
5(x-4)=x+8
5х-20=х+8
4х=28
х=7