Question

Conta a) 4 (2-2x)=24x Conta b) 3 (2-2x)=-7x Conta c) 6 (x-3) = 7 (x+1)-16

Answer 1

A) 
4(2-2x) = 24x

8 - 8x = 24x 

24x = 8 - 8x 

24x + 8x = 8

32x = 8 

x = 8/32

x = 1/4

B)
3(2-2x) = -7x 

6 - 6x = -7x 

6 = -7x + 6x

6 = -x

-x = 6

x = -6

C) 
6 (x-3) = 7 (x+1)-16

6x - 18 = 7x + 7 - 16 

6x - 7x = 18 + 7 - 16 

-x = 25 - 16 

-x = 9

x = -9

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06/04/2016
Sepauto - SSRC
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Answer 2

a)

4.(2 - 2x) = 24x
8 - 8x = 24x
8 = 24x + 8x
8 = 32x
32x = 8
x = 8/32
x = 8    (:8)          1
   -----          =   ------
     32   (:8)          4

x = 1/4
*******************************

b)
3.(2 - 2x)= - 7x
6 - 6x = - 7x
- 6x + 7x = - 6
7x - 6x = - 6
x = - 6
********************************

c)
6 (x-3) = 7 (x+1)-16
6x - 18 = 7x + 7 - 16
6x - 18 = 7x - 9
- 18 + 9 = 7x - 6x
- 9 = x
x = - 9