Question

9) Resolva as equações:

a) 7x - 1 = 13

b) 6x = 2x + 28

c) 5x - 2 = 18 + 3x

d) 6x - 10=2x + 14

e) 3. ( x + 2) = 15

f) 5.(x-1) = 30​

Answer 1

Resposta:

a) x = 2

b) x = 7

c) x = 10

d) x = 6

e) x = 3

f) x = 7

Explicação passo a passo:

a) 7x - 1 = 13

7x = 13 + 1

7x = 14

x = $\frac{14}{7}$

x = 2

b) 6x = 2x + 28

6x - 2x = 28

4x = 28

x = $\frac{28}{4}$

x = 7

c) 5x - 2 = 18 + 3x

5x - 3x = 18 + 2

2x = 20

x = $\frac{20}{2}$

x = 10

d) 6x - 10=2x + 14

6x - 2x = 14 + 10

4x = 24

x = $\frac{24}{4}$

x = 6

e) 3. ( x + 2) = 15

3x + 6 = 15

3x = 15 - 6

3x = 9

x = $\frac{9}{3}$

x = 3

f) 5.(x-1) = 30​

5x - 5 = 30

5x = 30 + 5

5x = 35

x = $\frac{35}{5}$

x = 7