Question

a) 7(x - 2) = 5(x + 3)
b) 2(x - 5) + 4(x - 1) = 0
c) 3(2x - 1) = -2(x + 3)
d) 7(x - 1) – 2(x - 5) = x - 5
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Answer 1

Oi...

a)

7(x - 2) = 5(x + 3)

7x - 14 = 5x + 15

7x - 5x = 15 + 14

2x = 29

x = 29/2

b)

2(x - 5) + 4(x - 1) = 0

2x - 10 + 4x - 4 = 0

6x - 14 = 0

6x = 14

x = 14/6 ÷ 2

x = 7/3

c)

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

6x - 3 = - 2x - 6

6x + 2x = - 6 + 3

8x = - 3

x = - 3/8

d)

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 = - 8/4

x = - 2

Boas lições.

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