0
Here is one explanation. Suppose A and B are two positive numbers.
-A*0 = 0
(B-B) = 0, so substitutong this value in place of 0 gives: -A*(B-B) = 0
expanding the bracket, -A*B -A*(-B) = 0
Adding A*B to both sides, A*B - A*B = -A*(-B) = A*B
But A*B - A*B = 0, which leave -A*(-B) = A*B
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