Решите уравнения : 1) 4-5х=0 2) 3-4х=х-12 3) (х++5)=2 4) 3(2х-1)+12=х 5) х/3+х/4=7

1)4-5х=0
-5х=-4
х=-4:(-5)
х=4/5=0,8

2)3-4х=х-12
-4х-х=-12-3
-5х=-15
х=-15:(-5)
х=3

3)(х+7)-(3х+5)=2
х+7-3х-5=2
х-3х=2+5-7
-2х=0
х=0

4)3(2х-1)+12=х
6х-3+12=х
6х-х=-12+3
5х=-9
х=-9:5
х=-1,8

5)
4x+3x=7*12
7x=84
x=84:7
х=12

1) 4 - 5x = 0
- 5x = -4
x = 4/5
2) 3 - 4x = x - 12
-4x - x = -3 - 12
- 5x = -15
x = 3
3) (x + 7) - (3x + 5) = 2
x + 7 - 3x - 5 = 2
x - 3x = 2 - 7 + 5
- 2x = 0
x = 0
4) 3 (2x -  1) + 12 = x
6x - 3 + 12 - x = 0
5x + 9 = 0
5x = -9
x = - 9/5 = - 1,8