Since the angles are complementary, their measures sum up to 90 degrees. The angles given are \( 2x + 3 \) and \( 2x \).
You can set up the equation as follows:
\[ (2x + 3) + 2x = 90 \]
This equation states that the sum of the angle measures \( (2x + 3) \) and \( 2x \) equals 90 degrees.
So, the final equation for the angle measures is:
\[ (2x + 3) + 2x = 90 \]