Two angles are considered complementary if the sum of their measures is 90 degrees. To form the equation based on the measures of the angles given, we can set up the following equation:
\[ (x + 2) + (2x - 4) = 90 \]
This equation states that the measure of the first angle, \(x + 2\), added to the measure of the second angle, \(2x - 4\), equals 90 degrees.