Question

resolva as equações a)3(x+1)=2(x+4) b)2(x+1)=(x+2) c)4(x+5)=2(x+3) d)x+5=25 e)2x+4=x+9 f)5x+2x=21 g)3x-x=14-2

Answer 1

Explicação passo-a-passo:

a)

3.(x + 1) = 2.(x + 4)

3x + 3 = 2x + 8

3x - 2x = 8 - 3

x = 5

b)

2.(x + 1) = x + 2

2x + 2 = x + 2

2x - x = 2 - 2

x = 0

c)

4.(x + 5) = 2.(x + 3)

4x + 20 = 2x + 6

4x - 2x = 6 - 20

2x = -14

x = -14/2

x = -7

d)

x + 5 = 25

x = 25 - 5

x = 20

e)

2x + 4 = x + 9

2x - x = 9 - 4

x = 5

f)

5x + 2x = 21

7x = 21

x = 21/7

x = 3

g)

3x - x = 14 - 2

2x = 12

x = 12/2

x = 6