Question

1-) Resolva as equações abaixo:
3x - 12 = 7 + x
c) 4x + 2 = 8 - 2x
a) 5+ x = 8
d) 5x – 20 = 0
f) 5(3 - x) - 4x = 18
e) x - 5 = -2x + 22​

Answer 1

a) 5 + x = 8

= x = 8 - 5

=x = 3

b) 3x - 12 = 7 + x

= 3x - x = 7 + 12

= 2x = 19

= x = 19/2

= x = 9,5

c) 4x + 2 = 8 - 2x

= 4x + 2x = 8 - 2

= 6x = 6

= x = 6/6

= x = 1

d) 5x - 20 = 0

= 5x = 20

= x = 20/5

= x = 4

e) x - 5 = - 2x + 22

= x + 2x = 22 + 5

= 3x = 27

= x = 27/3

= x = 9

f) 5(3 - x) - 4x = 18

= 15 - 5x - 4x = 18

= 15 - 9x = 18

= - 9x = 18 - 15

= - 9x = 3

3 1

= x = - — = - —

9 3