Уравнение 5x=2x+6; x+8=-15; 8-5x=13-3x
1.5x=2x+6
5x-2x=6
3x=6
x=2
2.х+8=-15
х=-15-8
х=-23
3.8-5х=13-3х
-5х+3х=13-8
-2х=5
х=-2,5