LON-CAPA simplifying rational expressions

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$\frac{21x^{-2}y^3}{15x^3y^{-5}} \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad$ as much as possible.

$\frac{7y^{15}}{5x^6} \quad \quad \quad \quad \quad$

$21x^6y \quad \quad \quad \quad \quad$

$\frac{7y}{x^2} \quad \quad \quad \quad \quad$

$\frac{7y^8}{5x^5} \quad \quad \quad \quad \quad$

$\mbox{None of these} \quad \quad \quad \quad \quad$

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