Justin has 3x+12 songs jim has 5x-4 songs if they both have the same number of songs how many songs do they each have?

According to the quesiton;

3x + 12 = 5x -4
12 + 4 = 5x - 3x
      16 = 2x
 16 / 2 = x
       8 = x
       x = 8

Now, substituting the value of "x" in one of the equation, we get,
3x + 12
= 3 (8) + 12 
= 24 + 12
= 36

5x- 4 = 36 because according to the question, 3x + 12 = 5x - 4

So, each of them have 36 songs