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Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by Jim@StratusPrep » Mon Mar 12, 2012 7:13 pm
simplify first to this:

xy +z = xy + xz

then

z = xz

when is this true?

both sides will be 0 if z = 0 or

both sides will be z if x = 1
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