Question

1. Resolva com atenção as
equações abaixo:
a) 3(3x + 10) = 5 + 4x
b) 5(x - 2) - 2(+ 14) = 24
c) 2(x + 1) = 6 - 4x
d) 6(x - 1) – 3(x + 1) = 30
e) 3x+10=x+20

Answer 1

a)

3(3x + 10)= 5 + 4x

9x + 30= 5 + 4x

9x - 4x= 5 - 30

5x= - 25

x= - 25/5

x= - 5

b)

5(x - 2) - 2(+14)= 24

5x - 10 - 28= 24

5x= 24 + 10 + 28

5x= 62

x= 62/ 5

c)

2(x + 1)= 6 - 4x

2x + 2= 6 - 4x

2x + 4x= 6 - 2

6x= 4

x= 4/ 6

d)

6(x - 1) - 3(x + 1)= 30

6x - 6 - 3x - 3= 30

6x - 3x= 30 + 6 + 3

3x= 39

x= 39/ 3

x= 13

e)

3x + 10= x + 20

3x - x= 20 - 10

2x= 10

x= 10/ 2

x= 5