Question

Resolva as questões a seguir.
1) x - 3 = 9






2) 4x - 9 = 1 - 2x/






3) x + 5 = 20 - 4x /








4) 9x - 4x + 10 = 7x - 30

5) -3 + 24 = -12




6) 2x + 28 = x + 18



7) 5x - 3 = 2x + 9


8) 3x - 26 = x - 2






9) 3b - 62 = 13






10) x - 2x - 1 = 105

Answer 1

Resposta:

1) x - 3 = 9

x = 9 + 3

x = 12

2) 4x - 9 = 1 - 2x

4x + 2x = 1 + 9

6x = 10

3) x + 5 = 20 - 4x

x + 4x = 20 - 5

5x = 15

x = 15 / 5

x = 3

4) 9x - 4x + 10 = 7x - 30

5x + 10 = 7x - 30

10 + 30 = 7x - 5x

40 = 2x

x = 40 / 2

x = 20

5) -3 + 24 = -12

21 = - 12

21 + 12 = 32

6) 2x + 28 = x + 18

2x - x = 18 - 28

x = - 10

7) 5x - 3 = 2x + 9

5x - 2x = 9 + 3

3x = 12

x = 12 / 3

x = 4

8) 3x - 26 = x - 2

3x - x = -2 + 26

2x = 24

x = 24 / 2

x = 12

9) 3b - 62 = 13

3b = 13 + 62

3b = 75

b = 75 / 3

b = 25

10) x - 2x - 1 = 105

-x = 105 + 1

-x = 106 × (-1)

x = -106

Espero ter ajudado!❤