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Real numbers $x$ and $y$ satisfy \begin{align*} x + xy^2 &= 250y, \\ x - xy^2 &= -240y. \end{align*}Enter all possible values of $x,$ separated by commas.

 May 2, 2021
 #1
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The possible values of x are 35 and -35, so the answer is "35,-35".

 May 2, 2021

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