Verified answer

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a.  4 x + 20 = 10  x + 3

    4 x - 10 x  = 3 - 20

    - 6 x = - 17

    x = 17/6

b.  3 x - 6 = 6 x + 24

     3 x - 6 x = 24 + 6

     - 3 x = 30

      x = - 10

c.  7 x - 5 x - 3 = 5 x - 15 + 2

     2 x - 5 x = - 15 + 2 + 3

     - 3 x =  - 10

       x = 10/3

d .  7 n + 14 - 3 = 25 - 3  n - 4

      7 n  + 3 n = 25 - 4 - 14 + 3

      10 n =   10

        n = 1

e .  4  y + 12 y - 6 = 3 y + 3

     16 y - 3 y = 3 + 6

     13 y =  9

        y = 9/13

Verified answer

4(x+5) = 10x+3

4*x + 4*5 = 10x+3

4x + 20 = 10x + 3

4x - 10x = 3 - 20

-6x = -17

x = 17/6

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

3x - 6 = 6x + 24

3x - 6x = 24 + 6

-3x = 30

x = 30/(-3) = -10

7x -5x - 3 = 5x - 15 + 2

2x - 3 = 5x - 13

-3x = -10

x = 10/3

7n + 14 - 3 = 25 - 3n - 4

7n + 3n = 21 - 11

10n = 10

n = 1

et

4y + 12y - 6 = 3y + 3

16y - 3y = 3 + 6

13y = 9

y = 9/13