2. 5+2х=-5
2х=-5
х=-2.5
3. 2x+6=3+5x
2х-5х=3-6
-3х=-3
х=1
4. (x-3)-(3x-4)=15
х-3-3х+4=15
х-3х=15+3-4
-2х=14
х=-7
5. 0.5x=-7.5
х=-15
6. 5-2x=4
-2х=4-5
х=0.5
7. 6x-9=2x+3
6х-2х=9+3
4х=12
х=3
8. 7-(3x+2)=-4x
7-3х-2=-4х
4х-3х=-7+2
х=-5
11. 7-2x=0
-2х=-7
х=3.5
12. 5-4x=x-1.5
-4х-х=-5-1.5
-5х=-6.5
х=1.3
13.x+2(3x-2)=10
х+6х-4=10
х+6х=10+4
7х=14
х=2