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(4a+1)(2a-1)
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alexis077

by alexis077 at September 13, 2009

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(4a+1)*2a-(4a+1)*-1 = 8a+2a-(-4a-1) = 8a+2a+4a+1=14a+1
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bumsoo_kim bumsoo_kim September 14, 2009

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