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Mathematics Handbook/Subtraction

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Revision as of 17:50, 1 November 2010 by 206.130.173.55 (talk) (Created page with '# a - 0 = a # a - (-a) = 2a # a - (a) = 0')
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  1. a - 0 = a
  2. a - (-a) = 2a
  3. a - (a) = 0
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