Question

1) Resolva as equações.
A)
$4(x + 1) = 12$
B)
$5(x - 3) - 4x = 18$
C)
$9x - 3(2x + 2) = 15$
D)
$2.5(x - 2) - 1.5x = 1$
E)
$3.5x + 8 = 2(x + 7)$
F)
$6(3x + 2) - 8 = - 2$
G)
$- 3(x - 5) - 2(2x + 1) = - 8$

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Answer 1

a)

4(x + 1) = 12

4x + 4 = 12

4x = 12 - 4

4x = 8

x = 8/4

x = 2

b)

5(x - 3) - 4x = 18

5x - 15 - 4x = 18

5x - 4x = 18 + 15

x = 33

c)

9x - 3(2x + 2) = 15

9x - 6x - 6 = 15

9x - 6x = 15 + 6

3x = 21

x = 21/3

x = 7

d)

2,5(x - 2) - 1,5x = 1

2,5x - 5 - 1,5x = 1

2,5x - 1,5x = 1 + 5

x = 6

e)

3,5x + 8 = 2(x + 7)

3,5x + 8 = 2x + 14

3,5x - 2x = 14 - 8

1,5x = 6

x = 6/1,5

x = 4

f)

6(3x + 2) - 8 = - 2

18x + 12 - 8 = - 2

18x = - 2 - 12 + 8

18x = - 6

x = - 6/18

x = - 1/3

g)

- 3(x - 5) - 2(2x + 1) = - 8

- 3x + 15 - 4x - 2 = - 8

- 3x - 4x = - 8 - 15 + 2

- 7x = 5

x = 5/- 7

x = - 5/7