Prove that (A - B) ∪ (B - A) = (A ∪ B) -(A ∩ B) using the set equality theorem

The best way to answer this is ?

hmmm

I know I have to use x.

so

x ∈ A

x ∈ A ∪ B

hmmm need to explain how the x is used in the (A - B) ∪ (B - A) and (A ∪ B) -(A ∩ B)

and also say a y is in both .....

am I on the right lines...?

any help would be appreciated thanks..