Teacher2Teacher 
Q&A #4168 
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From: Loydlin To: Teacher2Teacher Public Discussion Date: 2001113009:19:37 Subject: Re: Algebra I too had the proof at one time. It is based up on dividing by zero. At the beginning of the problem, you set a=b and then later divide by ab. Many students I tutor, have not been exposed to the idea that you can't divide by zero.
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