Question

4 x = - 12

7 x =- 21

13 x = 13

9 x = - 9

x - 39 = - 79

10 = x + 8

15 = x + 20

4 = x - 10

7 = x + 8

0=x+ 2

-3 = x + 10

FALE 40 PONTOS

Answer 1

4x = - 12
x = -12/4 = -3 ***
b
7x = -21
x = -21/7 = - 3 ***
c
13x = 13
x = 13/13 = 1 ****
d
9x = -9 
x = -9/9 = -1 ***
e
x - 39 = - 79
x = -79 + 39
x = - 40 ***
f
10 = x + 8
10 - 8 = x
2 = x
x = 2 ****
g
15 = x + 20
15 - 20 = x
x = 5 ***
h
4 = x - 10
4 + 10 = x
14 = x
x = 14 ****
i
7 = x + 8
7 - 8 = x
-1 = x
x = -1 ****
j
0 = x  + 2
x + 2 = 0
x = -2 ****
k
- 3 = x + 10
-3 - 10 = x
-13 = x
x = -13 ****

Answer 2

4x = - 12
x = -12/4
x = - 3

___________

7x = - 21
x = -21/7
x = -3

__________

13x = 13
x = 13/13
x = 1

_____________

9x = - 9
x = -9/9
x = -1

____________

x - 39 = - 79
x = - 79 + 39
x = - 40

___________

10 = x + 8
- x = 8 - 10
- x = - 2
x = 2

___________

15 = x + 20
- x = 20 - 15
- x = 5
x = - 5

____________

4 = x - 10
- x = - 10 - 4
- x = - 14
x = 14

_____________

7 = x + 8
- x = 8 - 7
- x = 1
x = - 1

____________

0 = x + 2
- x = 2
x = - 2

_____________

-3 = x + 10
- x = 10 + 3
- x = 13
x = - 13