Derive the Following Result $$\text { For all sets } B \text { and } C , ( B - C ) - B = \emptyset \text {. }$$

Derive the following result. You may do so either "algebraically" using the properties listed in
Theorem 6.2.2, being sure to give a reason for every step, or you may use the element method
for proving a set equals the empty set. $$\text { For all sets } B \text { and } C , ( B - C ) - B = \emptyset \text {. }$$