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April 19, 2014

Homework Help: Math (Algebra/Pre-Algebra)

Posted by Samantha on Thursday, June 4, 2009 at 8:53pm.

Which equation is an identity?

a. 3x - 9 = 3x
b. 4p + 7 = 7 + 4p
c. 2w = 0
d. 5k = 5

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