Question

Encontre o valor de “x” nas equações abaixo:

a) 4 + 4 = 12

b) 5. (3 − ) − 4 = 18

c) + + 8 = 54

d) − − 2 − 4 = 11

e) 7. ( − 1) − 2. ( − 5) = − 5

f) 2 − 3 = −9 − 4

g) 4. ( + 10) − 2. ( − 5) = 0​

Answer 1

Resposta:

a) x = 2

b) x = 0.33...

c) x = 23

d) x = -5

e) x = -2

f) x = -11

g) x = -25

Explicação passo-a-passo:

a)

4x + 4 = 12

4x = 12 -4

4x = 8

x=8:2

x=2

b)

5. (3 − x) − 4x = 18

5.3 -5x - 4x = 18

15 - 9x = 18

-9x = 18-15

-3 = 9x

-3:9 = x

x = -0.33...

c)

x + x + 8 = 54

2x = 54 - 8

2x = 46

x = 46:2

x = 23

d)

−x − 2x − 4 = 11

-3x = 11+4

-15 = 3x

x = -15:3

x = -5

e)

7. (X − 1) − 2. (X − 5) = x − 5

7x -7 -2x +10 = x -5

5x +3 = x - 5

5x-x = -5 -3

4x = -8

x = -2

f)

2 − 3x = −9 − 4x

4x -3x = -9 -2

x = -11

g)

4. (X + 10) − 2. (X − 5) = 0

4x +40 -2x +10 = 0

2x +50 = 0

2x = -50

x = -25