Respuesta :

zmcever

Answer:

All real numbers

Step-by-step explanation:

4 ( a + 3 ) = 12 + 4a

First, distibute on the left:

4 ( a + 3 )

( 4 x a ) + ( 4 x 3 )

4a + 12

4a + 12 = 12 + 4a

Subtract 12 from each side:

4a = 4a

Subtract 4a from each side:

0 = 0