Question

determine o valor de x em cada caso
a)9x + 3=12x + 18
b)7+8 x=12x - 21
c)3x + 30= -10- x
d)3x + 5= 5x-15
e)14x + 8 = -16 + 20x
f)25x + 750 = 20x + 250
g) X -13 = -5x - 19
h)5x - 35 = 29 + x
i)12x + 24 = 5x - 25
j)-2x + 36 =10x - 24​​

Answer 1

Resposta:

a) 9x - 12x = 18 - 3

- 3x = 15 .(-1)

3x = - 15

x = - 15/3

x = - 5

b) 8x - 12x = - 21 - 7

- 4x = - 28 .(-1)

4x = 28

x = 28/4

x = 7

c) 3x + x = - 10 - 30

4x = - 40

x = - 40/4

x = - 10

d) 3x - 5x = - 15 - 5

- 2x = - 20 .(-1)

2x = 20

x = 20/2

x = 10

e) 14x - 20x = - 16 - 8

- 6x = - 24 .(-1)

6x = 24

x = 24/6

x = 4

f) 25x - 20x = 250 - 750

5x = - 500

x = - 500/5

x = - 100

g) x + 5x = - 19 + 13

6x = - 6

x = - 6/6

x = - 1

h) 5x - x = 29 + 35

4x = 64

x = 64/4

x = 16

i) 12x - 5x = - 25 - 24

7x = - 49

x = - 49/7

x = - 7

j) - 2x - 10x = - 24 - 36

- 12x = - 60

x = - 60/- 12

x = 5