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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 8, 2021
 #1
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The possible values of x are 20, -20, 35, and -35.

 May 8, 2021

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