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July 30, 2014

July 30, 2014

Posted by **M** on Sunday, November 14, 2010 at 1:28am.

a x 9 = a x 7 + 2

- math -
**PsyDAG**, Sunday, November 14, 2010 at 9:52amOnline "*" is used to indicate multiplication, because x is often confused with an unknown.

a * 9 = a * (7+2)

What mathematical property does this involve?

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