Respuesta :

Answer:

18

Step-by-step explanation:

4a-3=2a

2a=3

a=1.5

12a=1.5*12

12a=18

4a - 2a = 3
2a = 3
2a/2 = 3/2
a = 1,5

12a = 12 • 1,5 = 18