1) 3x+10=5x 2) -100+4x=15 3) -8+2x=14 4) x+3=8x решите умоляю

1) 
3х + 10 = 5х
3х - 5х = - 10
- 2х = - 10
х = - 10 : (- 2)
х = 5

3 * 5 + 10 = 5 * 5
   15 + 10 = 25
            25 = 25

2)
- 100 + 4х = 15
4х = 100 + 15
4х = 115
х = 115 : 4
х = 28,75

- 100 + 4 * 28,75 = 15
         - 100 + 115 = 15
                        15 = 15

3)
- 8 + 2х = 14
2х = 8 + 14
2х = 22
х = 22 : 2
х = 11

- 8 + 2 * 11 = 14
     - 8 + 22 = 14
              14 = 14

4)
х + 3 = 8х
х - 8х = - 3
- 7х = - 3
х = - 3 : (- 7)
х = 3/7

3/7 + 3 = 8 * 3/7
   3 3/7 = 24/7
   3 3/7 = 3 3/7

1.
3х+10=5х
3х-5х=-10
-2х=-10
х=5
2.
-100+4х=15
4х=100+15
4х=115
х=28,75
3.
-8+2х=14
2х=14+8
2х=22
х=11
4.
х+3=8х
7х=3
х=3/7