1). 4x = 24 + x

4x - x = 24

3x = 24

x = 24/3

x = 8

2). 8x - 8 = 20 - 6x

8x + 6x = 20 + 8

14x = 28

x = 28/14

x = 2

3). 9 - 4x = 3x - 40

- 4x - 3x = - 40 - 9

- 7x = - 49

x = - 49 / - 7

x = 7

6). 5/6x + 16 = 4/9x + 9  

15/18x + 16 = 8/18x + 9

15/18x - 8/18x = 9 - 16

7/18x = -7

x = - 7 / (7/18)

x = - 18

Объяснение:

1) 4x=24+x

4x-x=24

3x= 24

x=8

2) 8x-8=20-6x

8x+6x=20+8

14x=28

x=2

3) 9-4x=3x-40

9+40=3x+4x

49=7x

x=7

4) 0.6x-5,4=-0,8x+5,8

0,6x+0,8x= 5,4+5,8

1,4x= 11,2

x= 8

5) 4,7 -1,1x = 0,5x-3,3

4,7+3,3=0,5x+1,1x

8= 1,6x

x=0,2

6) 5/6x +16= 4/9x+9

5/6x-4/9x= 9-16

7/18x = -7

x= -18