Question

3 + x = 0
23x + 2 =2
12 - 7 + 4x =25
5x - 3x =30

Answer 1

$3 + x = 0 \\ 3 + x - 3 = 0 - 3 \\ x = - 3$

.

$23x + 2 = 2 \\ 23x = 0 \\ x= 0$

.

$12 - 7 + 4x = 25 \\ 5 + 4x = 25 \\ 4x = 25 - 5 \\ 4x = 20 \\ x = 5$

.

$5x - 3x = 30 \\ 2x = 30 \\ x = 15$

Answer 2

Resposta:

3+x=0

x = - 3

23x+2=2

23x = 2 - 2

23x = 0

x = 0/23

x = 0

12-7+4x=25

4x = 25 - 12 + 7

4x =  20

x = 20/4

x = 5

5x-3x=30

2x = 30

x = 30/2

x = 15

Explicação passo-a-passo: