To find the measure of the exterior angle \( x \), we can use the property that an exterior angle of a triangle is equal to the sum of the two opposite interior angles.
In this case, the given angles are 63° and 43°. Therefore, we can calculate \( x \) as follows:
\[ x = 63° + 43° \]
Now let's calculate:
\[ x = 63° + 43° = 106° \]
Thus, the measure of the exterior angle \( x \) is:
\[ x = 106° \]