Решите уравнения: 1) 3х-2=13 2) 5х+2-3х=12-2х 3) 5(х+4)=10

1) 3x - 2 = 13
3x = 15
x = 5 

2) 5x - 3x + 2 = - 2x + 12
2x + 2 = - 2x + 12
2x + 2x = 12 - 2 
4x = 10
x = 10/4 = 5/2 = 2,5

3) 5(x + 4) = 10
x + 4 = 10/5 
x + 4 = 2
x = 2 - 4 
x =  - 2 

1) 3х-2=13
3х=13+2
3х=15
х=15:3
х=5

2) 5х+2-3х=12-2х
5х-3х+2х=12-2
4х=10
х=10:4
х=2 1\2
х=2,5

3) 5(х+4)=10
5х+5*4=10
5х+20=10
5х=10-20
5х=-10
х=-10:5
х=-2