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Let $x \spadesuit y = x^2/y^2$ for all x and y such that $y \neq 0$. Find all values of x such that $x \spadesuit 3 = 9$. List the values you find in increasing order, separated by commas.

 Apr 7, 2021
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$\frac{x^2}{9}=9\implies x^2=81$.

 Apr 7, 2021

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