Can't solve $(A\setminus B)\setminus C=(A\setminus C)\setminus (B\setminus C)=A\setminus (B\cup C)$ any help?

I have discrete math exam and i can't quite figure out one example.

$(A\setminus B)\setminus C=(A\setminus C)\setminus (B\setminus C)=A\setminus (B\cup C)$

i tried solving it like this and i got stuck: $(A\setminus B)\setminus C=(A\cap \overline{B})\cap \overline{C}$, what next ?

I have discrete math exam and i can't quite figure out one example.

$(A\setminus B)\setminus C=(A\setminus C)\setminus (B\setminus C)=A\setminus (B\cup C)$

i tried solving it like this and i got stuck: $(A\setminus B)\setminus C=(A\cap \overline{B})\cap \overline{C}$, what next ?