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Ayudenme porfavor, solo lo que esta en rojoEs para hoy?

Ayudenme porfavor, solo lo que esta en rojo Es para hoy.

Mejor respuesta

Olaantoni
4

12)

12 - (2x - 6) = - 5x + (2 - x)

12 - 2x + 6 = - 5x + 2 - x

18 - 2x = - 6x + 2 - 2x + 6x = 2 - 18

4x = - 16

x = - 16 / 4

x = - 4

13)

5x - [3x - (6 + x)] = 3

5x - [3x - 6 - x] = 3

5x - [2x - 6] = 3

5x - 2x + 6 = 3

3x = 3 - 6

3x = - 3

x = - 3 / 3

x = - 1

14)

20 - {4 - [3x + (x - 3)]} = 1

20 - {4 - [3x + x - 3]} = 1

20 - {4 - [4x - 3]} = 1

20 - {4 - 4x + 3} = 1

20 - {7 - 4x} = 1

20 - 7 + 4x = 1

13 + 4x = 1

4x = 1 - 13

4x = - 12

x = - 12 / 4

x = - 3

16)

9x - (5x + 1) - {2 + 8x - (7x - 5)} + 9x = 0

9x - 5x - 1 - {2 + 8x - 7x + 5} + 9x = 0

4x - 1 - {7 + x} + 9x = 0

4x - 1 - 7 - x + 9x = 0

12x - 8 = 0

12x = 8

x = 8 / 12

x = 2 / 3

18)

8(x - 3) - 4 = 27 - 3(2x - 5)

8x - 24 - 4 = 27 - 6x + 15

8x - 28 = 42 - 6x

8x + 6x = 42 + 28

14x = 70

x = 70 / 14

x = 5

20)

15 - 3(x - 1) = 2(x + 3) + 2

15 - 3x + 3 = 2x + 6 + 2

18 - 3x = 2x + 8

18 - 8 = 2x + 3x

10 = 5x

10 / 5 = x

2 = x

x = 2

22)

5 - 2(1 - 2x) = 4(4x - 3) + 9

5 - 2 + 4x = 16x - 12 + 9

3 + 4x = 16x - 3

3 + 3 = 16x - 4x

6 = 12x

6 / 12 = x

1 / 2 = x

x = 1 / 2

24)

2(3x - 1) + 3(x + 3) = 7(2x - 1) - 6

6x - 2 + 3x + 9 = 14x - 7 - 6

9x + 7 = 14x - 13

7 + 13 = 14x - 9x

20 = 5x

20 / 5 = x

4 = x

x = 4.