Question

12) 10 - 9 x + 2 x = 2 - 3x
13) x + 2 x – 1 – 3 = x
14) - 10 + 4-2x = - 4X-7
15) 2 - 4x = 32 - 18 x + 12
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Answer 1

Explicação:

12) 10 - 9 x + 2 x = 2 - 3x

- 9x + 2x + 3x = 2 - 10

- 7x + 3x = - 8

- 4x = - 8

x= - 8/-4

x=2

13) x + 2 x – 1 – 3 = x

x + 2x - x = 1 + 3

3x - x= 4

2x = 4

x= 4/2

x= 2

14) - 10 + 4-2x = - 4X-7

- 2x + 4x = - 7 + 10 - 4

2x = 3 - 4

2x = - 1

x= -1/2

15) 2 - 4x = 32 - 18 x + 12

- 4x + 18x = 32 + 12 - 2

14x = 44 - 2

14x = 42

x= 42/14

x= 3