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Need help with this, simple easy problem.

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(2x-y)^3+xy x=4 y=5

Its just confusing me, can some one explain the steps to me?
 Aug 29, 2013

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 #1
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Just incert the guven numbers into the equation. Or what sort of the expression this one belongs to - equation, one, needed to be simplified or smth else? If this is an equation it has to be equaled to something (number or expression)
 Aug 29, 2013

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