Question

28. 3x-1=4
-----------------
5



29. x+9=1
----------------
9



30. 4x+3 = 1
-------------------
5



31. 8x -5 = 9
------------------
2


32. x+4 = 1
-----------------
6


33. x -5 = 1
-------------------
7



34. 4 (x+1) = 12

Answer 1

28.

3x - 1  = 4
--------
   5

3x - 1 = 5.4
3x - 1 = 20
3x = 20 + 1
3x = 21
x = 21/3
x = 7

*********************
29.

x + 9   = 1
--------
  9

x + 9 = 9.1
x + 9 = 9
x = 9 - 9
x = 0

*******************
30.

4x + 3 = 1
---------
     5

4x + 3 = 5.1
4x + 3 = 5
4x = 5 - 3
4x = 2

x = 2  (:2)         1
     ----          = ----
       4  (:2)        2

************************
31.

8x - 5 = 9
--------
    2

8x - 5 = 2.9
8x - 5 = 18
8x = 18 + 5
8x = 23
x = 23/8

*********************
32.

x + 4 = 1
------- 
   6

x + 4 = 6.1
x + 4 = 6
x = 6 - 4
x = 2

*****************************

33.

x - 5 = 1
-------
   7

x - 5 = 7.1
x - 5 = 7
x = 7 + 5
x = 12

***************************
34.

4.(x + 1) = 12
4x + 4 = 12
4x = 12 - 4
4x = 8
x = 8/4
x = 2

****************************

35)
5.(3 - x) - 4x = 18
15 - 5x - 4x = 18
15 - 9x = 18
15 - 18 = 9x
- 3 = 9x
9x = - 3
x = - 3  (:3)        - 1
      ------        =  ------
        9   (:3)         3

****************************
36)

9x - 3.(2x + 2) = 15
9x - 6x - 6 = 15
3x - 6 = 15
3x = 15 + 6
3x = 21
x = 21/3
x = 7

**********************************
37)

6.(3x + 2) - 8 = - 2
18x + 12 - 8 = - 2
18x + 4 = - 2
18x = - 2 - 4
18x = - 6
x = - 6   (:6)       - 1
      ------        =  -----
        18  (:6)         3

************************************

38)

- 3.(x - 5) - 2.(2x + 1 ) - 8 = 20
- 3x + 15 - 4x - 2 - 8 = 20
- 3x - 4x + 15 - 10 = 20
- 7x + 5 = 20
- 20 + 5 = 7x 
- 15 = 7x
7x = - 15
x = - 15/7

******************* 
39)

2.(x + 1) + 10 = 38
2x + 2 + 10 = 38
2x + 12 = 38
2x = 38 - 12
2x = 26
x = 26/2
x = 13

******************************
40)
x - 2 + 2x = 5x
------------   ------
        3          2

2.(3x - 2) = 3.5x
6x - 4 = 15x
- 4 = 15x - 6x
- 4 = 9x
9x = - 4
x = - 4/9

(é fracao a 40, 2  embaixo de 5x e 3 embaixo de x -2 + 2x)

1.

1 + 3x = 16
3x = 16 - 1
3x = 15
x = 15/3
x = 5

2.

x - 1 = 5
          -----
            6

6.(x - 1) = 5
6x - 6 = 5
6x = 5 + 6
6x = 11
x = 11/6

3.

x + 1 + 7 = 5x
x + 8 = 5x
8 = 5x - x
8 = 4x
4x = 8
x = 8/4
x = 2

4.

x + 3 = 8
x = 8 - 3
x = 5

****************************
7.

 x     +  1    =  2
-----
  7

x + 7 = 14
-------    -----
  7          7

x + 7 = 14
x = 14 - 7
x = 7

12.

x + 101 = 300
x = 300 - 101
x = 199

20.

0 = x + 18
- 18 = x
x = - 18

21)

- 7 = x + 50
- 7 - 50 = x
- 57 = x
x = - 57