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A={1,2,3,4,5}; B={4,5,6,7}A - B={1,2,3}
B - A={6,7}
Clearly it is seen that:
(A-B) \neq (B-A).
1 5 1
A - B means the numbers which are in A but not in B
B - A means the numbers which are in B but not in A 
So A=(1,2,3)
 Then A - B and B-A are not equal.

0 0 0
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