The value of x in the diagram is 60°
The sum of the exterior angles of any polygon, regardless of the number of sides, is always 360 degrees.
The polygon is a six sided polygon. This means is an hexagon. The polygon is a regular polygon this means all it's sides and angles are equal.
Therefore:
This means that x + x + x + x + x + x = 360
6x = 360°
divide both sides by 6
x = 360/6
x = 60°
Therefore , each missing angles is 60°. And the value of x in the diagram is 60°