From the image we will find x as follows:
We can see that one o the angles in the same triangle as x has a measure of 90°, and the complementary angle has to be 90°, so the missing side (That will be right besides x) has a measurement of 70°.
Since the shape is a parallelogram we will have the following:
Now, we solve for x:
So, the measurement of x is 55°.