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2015-05-06T18:36:45+08:00

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Negative*Negative=Positive
Positive*Positive=Positive
Negative*Positive=Negative

Let the negative be (-) and positive be represented as (+)
(-)*(-)*(+)*(+)*(+)

We know that Negative*Negative=Positive

So we simplify this to:
(+)*(+)*(+)*(+)

And this is a positive value.
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