Ответ:

1) 5(x-3)=-2(x-4)+6

5*x-5*3=-2*x-2*(-4)+6

5x-15=-2x+8+6

5x+2x=8+6+15

7x=29

x=29:7

x=4 1/7

2) 1+7(х-2)=5(3-2х)+31 + 7х - 14 = 15 - 10х + 3

7х + 10х = 15 + 3 - 1 + 14

17х = 31

х = 31 : 17

х = 1 14/17

3)  9-6(7-5х)=8+2(х+4)

9-6*7+6*5х=8+2*х+2*4

9-42+30х=8+2х+8

30х-2х=8+8+42-9

28х=48

х=1,75

4) 9/10x=-5 ; x≠0

9= -50x

-50x =9

x = -9/50, x≠0

x=-9/50

x= - 0.18

5)-3/7х = -27/49

х = -27/49 : (-3/7)

х = -27/49 * (-7/3)

х = 9/7

х = 1 2/7

6) 9x-6(-2+x)=-7•5x+20

9x+12-6x=-35x+20

3x+12=-35x+20

3x+35x=20-12

38x=8

x=4/19

7) -3(6x+2)-1=4(x-3)-9

-18x-6-1=4x-12-9

-18x-7=4x-21

-18x-4x=-21+7

-22x=-14

x= 7/11

8) -2/3x=-5/30, x≠0

-2/3x=-1/6

-12=-3x

-3x=-12

x=4

9) -5(-5+3x)-1=9x+5•6

25-15x-1=9x+30

24-15x=9x+30

-15x-9x=30-24

-24x=6

x=-1/4

x= -0.25