We can say that Line L and Line M are parallel to each other if, when cut by a transversal line, the corresponding angles, the alternate exterior angles, and the alternate interior angles are congruent.
In the figure shown, we have a pair of alternate exterior angles. Therefore, the two angles must be equal to each other. With that, we have the following equation:
From that equation, we can solve x by joining like terms on either side of the equation.
Therefore, x = 7. When asked, the measure of the two angles are 11 degrees.