Math Is Fun Forum

Hi everyone,
I am doing discrete math this semester & am currently working on set identities. I have worked through some examples & seem to be able to figure most out, however the following one has me stumped

Use the set property A-B=A n B' to show that for all sets A,B and C  (n=intersection, U = union)
A-(B U C) = (A-B) n (A-C)

So I m starting with the RHS of equation, as it is more complex and want to simplify it

(A-B) n (A-C)
(A n B') n (A n C')

I'm stuck here.......any suggestions?