Need help finding the value of X

Answer: I believe the answer to your question will be x=6
Step-by-step explanation:
As you can see that whole side is 15. And the top half is 6. well all you need to do is cut 15 in half. And when you do will look a lot like the other side of the top half of the triangle.
I hope you understand what I was trying to say. Sorry if you don't. I'm not really good at explaining things. But, your answer will be x=6.