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The negative of a negative number is a positive number. The reason for this is that the first negative is a place holder for -1. When you have - - 4, that translates into -1 x -4. When you multiply two negative numbers, you get a positive.

For example:

- - 7 = -1 x -7 = 7

- - r = -1 x -r = r

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โˆ™ 2010-03-29 07:33:38
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Q: Why does minus of minus equals plus?
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