Respuesta :

[tex]-2a = 12 -4a\\\\\implies -2a +4a=12 \\\\\implies 2a = 12\\\\\implies a= \dfrac{12}2 =6[/tex]

Answer:

Step-by-step explanation:

-2a=12-4a

+4a    +4a

2a = 12

/2     /2

a = 6