7-5x=x-2
5x+x=-7+2
6x=-5

1) 7-5х=х-2
-5х-х=-2-7
-6х=-9
х=-9/-6
х=1.5
2) 5х+х=-7+2
6х=5
х=5/6
3) 6х=-5
х=-5-6
х=-11