Question

respuesta de 30+4=2x-12

Answer 1

$30+4=2x-12 \\ 34+12=2x \\ 46=2x \\ x= \frac{46}{2} \\ x=23$

Answer 2

30 + 4 = 2x - 12

34 = 2x - 12

- 2x = - 12 - 34

- 2x = - 46

x = -46/-2

x = 23

Solución : 

x = 23