Sociologia, perguntado por vinicius6259, 11 meses atrás

a) 3(x-1)-7=15 b) 7(x-4=2x-3 c) 3(x-2)=4(3-x) d) 2(3x-1)=4(3x+2)

Soluções para a tarefa

Respondido por rofigabriela11
1



a)

3.(2x + 3) - 4.(x - 1) = 3

6x + 9 - 4x + 4 = 3

2x + 13 = 3

2x = 3 - 13

2x = - 10

x = -10/2

x = - 5


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B)

7.(x - 1) - 2.(x - 5) = x - 5

7x - 7 - 2x + 10 = x - 5

7x - 2x - 7 + 10 = x - 5

5x + 3 = x - 5

5x - x = - 5 - 3

4x = - 8

x = -8/4

x = - 2


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C)

2.(3 - x) = 3.(x - 4) + 15

6 - 2x = 3x - 12 + 15

6 - 2x = 3x + 3

6 - 3 = 3x + 2x

3 = 5x

5x = 3

x  =  3/5


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D)

3.(5 - x) - 3.(1 - 2x) = 42

15 - 3x - 3 + 6x = 42

12 + 3x = 42

3x = 42 - 12

3x = 30

x = 30/3

x = 10


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E)

(4x + 6) - 2x = (x - 6) + 10 + 14

4x + 6 - 2x = x - 6 + 24

2x + 6 = x + 18

2x - x = 18 - 6

x = 12


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F)

(x - 3) - (x + 2) + 2.(x - 1) - 5 = 0

x - 3 - x - 2 + 2x - 2 - 5 = 0

- 5 + 2x - 7 = 0

2x - 5 - 7 = 0

2x - 12 = 0

2x = 12

x = 12/2

x = 6


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G)

3x - 2.(4x - 3) = 2 - 3.(x - 1)

3x - 8x + 6 = 2 - 3x + 3

- 5x + 6 = 5 - 3x

6 - 5 = - 3x + 5x

1 = 2x

2x = 1

x = 1/2


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H)

3.(x - 1) - (x - 3) + 5.(x - 2) = 18

3x - 3 - x + 3 + 5x - 10 = 18

3x - x + 5x - 10 = 18

2x + 5x = 18 + 10

7x = 28

x = 28/7

x = 4


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I)

5.(x - 3) - 4.(x + 2) = 2 + 3.(1 - 2x)

5x - 15 - 4x - 8 = 2 + 3 - 6x

x - 23 = 5 - 6x

x + 6x = 5 + 23

7x = 28

x = 28/7

x = 4

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