Question

Resolva as equações em R 

a) 2 x + 6 = x + 18 

b) 5 x – 3 = 2 x + 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

 f) 3x – 5 = x – 2 7) 3x – 5 = 13 

g) 3x + 5 = 2 9) x – (2x – 1) = 23

h) 2x – (x – 1) = 5 – (x – 3)

me ajudem pfvr. ​

Answer 1

Resposta:

a) 2 x + 6 = x + 18

2x - x = 18 - 6

x = 12

b) 5 x – 3 = 2 x + 9

5x - 2x = 9 + 3

3x = 12

x = $\frac{12}{3\\}$

x = 4

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

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

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

5x = 25

x = 5

d) 2x + 3 (x – 5) = 4x + 9

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

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

x = 24

e) 2 (x + 1) – 3 (2x – 5) = 6x – 3

2x  + 2 - 6x + 15 = 6x - 3

2x - 6x - 6x = - 3  - 2 - 15

-10x = -20

10x = 20

x = 2

nesses dois itens (f e g) acho que teve algum erro de digitaçao

h) 2x – (x – 1) = 5 – (x – 3)

2x - x + 1 = 5 - x + 3

2x - x + x = 5 + 3 - 1

2x = 7

x = $\frac{7}{2}$  ou  x = 3,5