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2015-09-13T14:23:41+08:00

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Ex: -5 -5
= -10

ex: -7 + 5
= -2
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2015-09-13T17:07:40+08:00
Beacuse in there are opposite number ex -1 - -1 = 2 why 1-1 = 0 now the signed number is same it will became a plus or add
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