1. The problem asks for the complement of the angle $90 - x$ degrees. 2. Recall that the complement of an angle $\theta$ is $90^\circ - \theta$. 3. Using this formula, the complement of $90 - x$ is: $$90 - (90 - x)$$ 4. Simplify the expression: $$90 - 90 + x = x$$ 5. Therefore, the complement of the angle $90 - x$ degrees is $x$ degrees.