Question

2-Resolva as equações, sendo U=Q:
A 6x=2x+16
B 2x-5=x+1
C 2x+3=x+4
D 5x+7=4x+10
E 4x-10=2x+2
F 4x-7=8x-2
G 2x+1=4x-7
H 9x+9+3x=15
I 16x-1=12x+3
J 3x-2=4x+9

Answer 1

A) 
6x = 2x + 16
6x - 2x = 16
4x = 16
x = 16/4
x = 4

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B)
2x - 5 = x + 1
2x - x = 1 + 5
x = 6

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C)
2x + 3 = x + 4
2x - x = 4 - 3
x = 1

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D) 
5x + 7 = 4x + 10
5x - 4x = 10 - 7
x = 3

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E)
4x - 10 = 2x + 2
4x - 2x = 2 + 10
2x = 12
x = 12/2
x = 6

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F) 

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

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G) 
2x + 1 = 4x - 7
1 + 7 = 4x - 2x
8 = 2x
2x = 8
x = 8/2
x = 4

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H) 

9x + 9 + 3x = 15
12x + 9 = 15
12x = 15 - 9
12x = 6
x =   6  (:6)
       -----
        12  (:6)

x =  1
      -----
       2

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I)

16x-1=12x+3
16x - 12x = 3 + 1
4x = 4
x = 4/4
x = 1

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J) 
3x - 2 = 4x + 9
- 2 - 9 = 4x - 3x
- 11 = x
x = - 11

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Answer 2

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