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September 20, 2014

September 20, 2014

Posted by **judy williams** on Saturday, July 2, 2011 at 11:54pm.

- math -
**Henry**, Sunday, July 3, 2011 at 8:21pm-X - Y = - Y - X,

-X + (-Y) = -Y + (-X)..

Commutative Property: The order of addition does not matter.

a + b = b + a.

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