Let's define Juwan's number as \( x \).
According to the problem statement, we have the equation:
\[ 2(x + 12) = 3x - 4 \]
Now, let's solve for \( x \).
First, distribute the 2 on the left side:
\[ 2x + 24 = 3x - 4 \]
Next, we will move all terms involving \( x \) to one side and constant terms to the other. Subtract \( 2x \) from both sides:
\[ 24 = x - 4 \]
Now, add 4 to both sides:
\[ 24 + 4 = x \] \[ x = 28 \]
Therefore, the number Juwan is thinking of is \( \boxed{28} \).