Question

Resolva as equações a seguir.

Answer 1

a)

2x/3 - 1/6 = x/15

20x - 5 = 2x

20x - 2x = 5

18x = 5

x = 5/18

b)

(3 - b)/2 + b = b/4 - 2

4(3 - b) + 4b = b - 8

12 - 4b + 4b + 8 = b

b = 20

c)

4(x - 3)/5 - 2(x + 3)/10 = x/25

40(x - 3) - 10(x + 3) = 2x

40x - 120 - 10x - 30 = 2x

30x - 2x = 120 + 30

28x = 150

x = 150/28

x = 75/14

d)

y/4 + y/6 - y/8 = (2 - y)/2

6y + 4y - 3y = 12(2 - y)

7y = 24 - 12y

7y + 12y = 24

19y = 24

y = 24/19

Resposta:

a) x = 5/18

b) b = 20

c) x = 75/14

d) y = 24/19