12 (x + 3) = 4 (2x + 9) + 4x

All real numbers

Step-by-step explanation:

12 (x+3) = 4 (2x+9) + 4x

First you are going to distibute 12 and 4 into the paranthese to get:

12x+36=8x+36+4x

Next you are going to combine like terms (the 8x and 4x) to get:

12x+36=12x+36

Since both sides of the equation equal each other this means that x can equal any real number since they always equal each other.