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a)
x + 7 = 11 - 5x
----- ------ ------
6 2 3
6x + 7 3.11 - 2.5x
---------- = -----------------
6 6
6x + 7 = 33 - 10x
6x + 10x = 33 - 7
16x = 26
x = 26 (:2) 13
----- = ------
16 (:2) 8
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
1 . (4x - 12) = 6x
----- -----
6 5
5.(4x - 12 ) = 6.6x
20x - 60 = 36x
- 60 = 36x - 20x
- 60 = 16x
16x = - 60
x = - 60 (:4) - 15
------- = -------
16 (:4) 4
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
4x - 12 = 2.(x + 7)
4x - 12 = 2x + 14
4x - 2x = 14 + 12
2x = 26
x = 26/2
x = 13
***********************************
x + 7 = 11 - 5x
----- ------ ------
6 2 3
6x + 7 3.11 - 2.5x
---------- = -----------------
6 6
6x + 7 = 33 - 10x
6x + 10x = 33 - 7
16x = 26
x = 26 (:2) 13
----- = ------
16 (:2) 8
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
1 . (4x - 12) = 6x
----- -----
6 5
5.(4x - 12 ) = 6.6x
20x - 60 = 36x
- 60 = 36x - 20x
- 60 = 16x
16x = - 60
x = - 60 (:4) - 15
------- = -------
16 (:4) 4
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
4x - 12 = 2.(x + 7)
4x - 12 = 2x + 14
4x - 2x = 14 + 12
2x = 26
x = 26/2
x = 13
***********************************
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