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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:

.

B - A={6,7}

Clearly it is seen that:

.

B - A means the numbers which are in B but not in A

So A=(1,2,3)

B=(6,7)

Then A - B and B-A are not equal.