Question

Resolva a equação 16x = 8.

Resolva a equação 2x + 3 = 19

Resolva a equação 2x + 2x+1 = 24.

Resolva a equação 7x + 3 = 1.

Resolva a equação 2x + 2x-1 = 12.

Resolva a equação 3 . (3x + 4) = 81.

Resolva a equação 10(3x+3) = 10.

Resolva a equação 2(5x+2) = 50.

Answer 1

1- 16x = 8
x= 8/16
x = 1/2 = 0,5

2- 2x+3=19
2x= 19-3
2x=16
x=16/2--->8

3- 2x + 2x+1=24
4x= 24-1
4x= 23
x= 23/4= 5,75

4- 7x+3=1
7x= 1-3
7x= -2
x= -2/7= -0,28

5- 2x+2x+1=12
4x= 12-1
4x= 13
x= 13/4= 3,25

6- 3.(3x+4)=81
9x+ 12= 81
9x= 81-12
9x= 69
x= 69/9 = 7,66

6- 10.(3x+3)=10
30x + 30= 10
30x= 10 -30
30x= -20
x= -2/3
x= -0,66

7- 2.(5x + 2)= 50
10x + 4 = 50
10x= 50-4
10x= 46
x= 4,6

Answer 2

a)

16x = 8
x =   8  (:8)
      ------
       16  (:8)

x =   1/2

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b)

2x + 3 = 19
2x = 19 - 3
2x = 16
x = 16/2
x = 8

*************************
c)

2x + 2x + 1 = 24
4x + 1 = 24
4x = 24 - 1
4x = 23
x = 23/4

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d)

7x + 3 = 1
7x = 1 - 3
7x = - 2
x = - 2/7

*************************
e)

2x + 2x - 1 = 12
4x - 1 = 12
4x = 12 + 1
4x = 13
x = 13/4

*****************************
f)

3.(3x + 4) = 81
9x + 12 = 81
9x = 81 - 12
9x = 69
x = 69/9

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g)

10.(3x + 3) = 10
30x + 30 = 10
30x = 10 - 30
30x = - 20
x =  - 20  (:10)
       -------
         30  (:10)

x = - 2
      ------
        3

***********************
h)

2.(5x + 2) = 50
10x + 4 = 50
10x = 50 - 4
10x = 46
x =   46  (:2)
       ------
        10  (:2)

x = 23
     ------
        5

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