Question

Resolva as seguintes equações:
a) x + 5 = 8
b) x - 4 = 3
c) x + 6 = 5
d) x - 3 = - 7
e) x + 9 = -1
f) x + 28 = 11
g) x - 109 = 5
h) x - 39 = -79
i) 3x + 5 = 20
j) 2x - 6 = 8
k) 4x - 5 = - 17
l) 7x + 7 = - 21
m) 13x - 8 = 18
n) 9x - 36 = - 9
o) 25x = 0
p) 35x = -105

Answer 1

a)

x + 5 = 8

x = 8 - 5

x = 3

b)

x - 4 = 3

x = 3 + 4

x = 7

c)

x + 6 = 5

x = 5 - 6

x = - 1

d)

x - 3 = - 7

x = 3 - 7

x = - 4

e)

x + 9 = - 1

x = - 1 - 9

x = - 10

f)

x + 28 = 11

x = 11 - 28

x = - 17

g)

x = 109 - 5

x = 5 + 109

x = 114

h)

x - 39 = - 79

x = 39 - 79

x = - 40

i)

3x + 5 = 20

3x = 20 - 5

3x = 15

x = 15/3

x = 5

j)

2x - 6 = 8

x - 3 = 4

x = 4 + 3

x = 7

k)

4x - 5 = - 17

4x = 5 - 17

4x = - 12

x = - 12/4

x = - 3

l)

7x + 7 = - 21

x + 1 = - 7

x = - 1 - 7

x = - 8

m)

13x - 8 = 18

13x = 18 + 8

13x = 26

x = 26/13

x = 2

n)

9x - 36 = - 9

9x = 36 - 9

9x = 27

x = 27/9

x = 3

o)

25x = 0

x = 0/25

x = 0

p)

35x = - 105

x = - 105/35

x = - 3

Resposta:

a) 3

b) 7

c) - 1

d) - 4

e) - 10

f) - 17

g) 114

h) - 40

i) 5

j) 7

k) - 3

l) - 8

m) 2

n) 3

o) 0

p) - 3