Answer:
jan is 8
Step-by-step explanation:
There should be a typo in the question: the correct formula would be

Let's compute
first. We have

If we intersect this set with X, we have

So, that would be the left hand side. For the right hand side, we have

And their union is again 
The answer is 21.
Explanation:
5x3=15
15+6=21
5cm is the answer your looking for