Question

18) Resolva as equações:
a) 6x = 2x + 16
b) 4x – 10 = 2x + 2
c) 2x + 1 = 4x – 7
d) 3x – 2 = 4x + 9
e) 5x + 4 = 3x – 2x + 4
f) x + x – 4 = 17 – 2x + 4
g) 3,4x – 2,6 = x - 0,92
h) 0,1x + 3x + 0,9x = 14 + 2x
i) 4x – 6 = 22
j) 9 – x = 2x
k) 8 + 4x = 6x – 4
l) 3x + 1 = x + 9
m)7 (x – 2) = 5 (x + 4)
n) 3 (2x – 1) = –2 (x + 3)
o) (7x – 8) 2 = 6 (3x – 4)
p) 12 + (3x + 6) (–7) – 5 = 70

Answer 1

Resposta:

a)6x=2x+16

6x-2x=16

4x=16

x=16/4

x=4

b)4x-10=2x+2

4x-2x=2+10

2x=12

x=12/2

x=6

c) 2x + 1 = 4x -7

2x-4x=-7-1

2x=-8

x=-8/2

x=-4

d) 3x -2 = 4x + 9

3x-4x=9+2

-x=11 .(-1)

x=-11

e) 5x + 4 = 3x - 2x + 4

5x-3x+2x=4-4

4x=0

x=0/4

x=0

f) x + x - 4 = 17 - 2x + 1

2x+2x=18+4

4x=22

x=22/4

x=5,4

g) 3,4x -2,6 = x - 0,92

3,4x+x=-0,92+2,6

4,4x=3,52

x=3,52/4,4

x=0,8

h) 0,1x + 3x + 0,9x = 14 + 2x

4x-2x=14

2x=14

x=14/2

x=7