Question

1) Determine o valor de x em cada caso:
a) 6x = 2x + 16 =
b) 2x - 5=x+1
c) 2x +3 = x +4
d) 5x + 7 = 4x + 10
e) 4x - 10 = 2x + 2
f) 4x - 7 = 8x - 2
g) 2x + 1 = 4x - 7
h) 9x + 9 + 3x = 15​

Answer 1

a) 6x = 2x + 16

= 6x - 2x = 16

= 4x = 16

= x = 16/4

= x = 4

b) 2x - 5 = x + 1

= 2x - x = 1 + 5

= x = 6

c) 2x + 3 = x + 4

= 2x - x = 4 - 3

= x = 1

d) 5x + 7 = 4x + 10

= 5x - 4x = 10 - 7

= x = 3

e) 4x - 10 = 2x + 2

= 4x - 2x = 2 + 10

= 2x = 12

= x = 12/2

= x = 6

f) 4x - 7 = 8x - 2

= 4x - 8x = - 2 + 7

= - 4x = 5

5

= x = - —

4

= x = ‐ 1,25

g) 2x + 1 = 4x - 7

= 2x - 4x = - 7 - 1

= - 2x = - 8

= x = - 8 / - 2

= x = 4

h) 9x + 9 + 3x = 15

= 9x + 3x = 15 - 9

= 12x = 6

= x = 6/12

= x 0,5