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"(-A) not necessary to be negative, it is negative if (A) is positive, and it is positive if (A) is negative". explain?

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Question added by Raafat Sallam , Organizational Development and Training Consultant , Training Centers, Marketing Organizations.
Date Posted: 2013/10/24
Ahmed Montasser Hasan Ibraheem Farag
by Ahmed Montasser Hasan Ibraheem Farag , Project Manager , Rawafed Tech

let A is negative and equal (-9) then the -A is -(-9) which is9, if A is postive then -A equal -9, the rule the negative of negative is postive.

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