Question

a) 2x + 6 = x + 18 b) 5x – 3 = 2x + 9 c) 3(2x – 3) + 2(x + 1) = 3x + 18 d) 2x + 3(x – 5) = 4x + 9 e) 2(x + 1) – 3(2x – 5) = 6x – 3

Answer 1

Explicação passo-a-passo:

a)

2x + 6 = x + 18

2x - x = 18 - 6

x = 12

b)

5x - 3 = 2x + 9

5x - 2x = 9 + 3

3x = 12

x = 12/3

x = 4

c)

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

6x - 9 + 2x + 2 = 3x + 18

8x - 7 = 3x + 18

8x - 3x = 18 + 7

5x = 25

x = 25/5

x = 5

d)

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

2x + 3x - 15 = 4x + 9

5x - 15 = 4x + 9

5x - 4x = 9 + 15

x = 24

e)

2.(x + 1) - 3.(2x - 5) = 6x - 3

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

17 - 4x = 6x - 3

6x + 4x = 17 + 3

10x = 20

x = 20/10

x = 2