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posted by ethen Monday, April 13, 2009 at 11:15am.

7x+21y-7=x+3y-1 GCF 7

your statement of 7x+21y-7=x+3y-1 GCF 7 is a false statement. write it as 7x + 21y - 7 = 7(x + 3y - 1)

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