The measure of an interior angle of a regular $n$-sided polygon is calculated as
$$\frac{(n-2) \cdot 180^{\circ}}{n}.$$
In the figure, a regular nonagon and a regular pentagon sharing one side are given, along with a blue line segment connecting one vertex of each polygon.
Accordingly, what is the measure of angle $x$ in degrees?
A) 64\\
B) 66\\
C) 68\\
D) 70\\
E) 72