
We know that

so:

As we see there are 4 such pairs:
Answer:
The answer to your question is x = 7.5
Step-by-step explanation:
Process
I inserted the answer as an image because it said that I was writing inappropriate words.
You do 120+48+92=280
All angles in a quadrilateral add up to 360, so 360-280=80
The answer is 80
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