<h2>
Hello!</h2>
The answer is:
The missing angle "x" is equal to 130°.
<h2>
Why?</h2>
We need to remember that the sum of all of the angles of any polygon will be all equal to 360°.
So, we are given the following exterior angles:

Now, if the sum of all the exterior angles is equal to 360°, we can use it to calculate "x", so:

Hence, the missing angle "x" is equal to 130°.
Have a nice day!