Question

o valor de

2x + 6 = x +18:

5x-3=2x +9:

3(2x-3)+2(x+1)=3x+18:

2x +3(X-5)=4x+9:

2(x+1)-3(2x-5)=6x-3

3x-5=x-2

3x-5=13

3x+5=2

x-(2x-1)=23

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

18x-43=65

23x-16=14-17x

10y-5(1+y)=3(2y-2)-20

-3(3x - 42)= 2 (7x - 52)

Answer 1

Olá...

a)

2x + 6 = x + 18

2x - x = 18 - 6

x = 12

b)

5x - 3 = 2x + 9

5x - 2x = 9 + 3

3x = 12

x = 12/3

x = 4

c)

3(2x - 3) + 2(x + 1) = 3x + 18

6x - 9 + 2x + 2 = 3x + 18

8x - 7 = 3x + 18

8x - 3x = 18 + 7

5x = 25

x = 25/5

x = 5

d)

2x + 3(x - 5) = 4x + 9

2x + 3x - 15 = 4x + 9

5x - 15 = 4x + 9

5x - 4x = 9 + 15

x = 24

e)

2(x + 1) - 3(2x -5) = 6x - 3

2x + 2 - 6x + 15 = 6x - 3

- 4x + 17 = 6x - 3

- 4x - 6x = - 3 - 17

- 10x = - 20 ⇒(- 1)

10x = 20

x = 20/10 ÷ 10

x = 2

f)

3x - 5 = x - 2

3x - x = - 2 + 5

2x = 3

x = 3/2

g)

3x - 5 = 13

3x = 13 + 5

3x = 18

x = 18/3

x = 6

h)

3x + 5 = 2

3x = 2 - 5

3x = - 3

x = - 3/3

x = - 1

i)

x - (2x - 1) = 23

x - 2x + 1 = 23

- x + 1 = 23

- x = 23 - 1

- x = 22 ⇒( - 1)

x = - 22

j)

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

2x - x + 1 = 5 - x + 3

2x - x + x + 1 = 8

2x + 1 = 8

2x = 8 - 1

2x = 7

x = 7/2

k)

18x - 43 = 65

18x = 65 + 43

18 x = 108

x = 108/18

x = 6

l)

23x - 16 = 14 - 17x

23x + 17x = 14 + 16

40x = 30

x = 30/40 ÷ 10

x = 3/4

m)

10y - 5(1 + y) = 3(2y - 2) - 20

10y - 5 - 5y = 6y - 6 - 20

5y - 5 = 6y - 26

5y - 6y = - 26 + 5

- y = - 21 ⇒ ( - 1)

y = 21

n)

- 3(3x - 42) = 2 (7x - 52)

- 9x + 126 = 14x - 104

- 9x - 14x = - 104 - 126

- 23x = - 230 ⇒(- 1)

23x = 230

x = 230/23

x = 10

Espero ter ajudado.