Answer
$\frac{1}{4}x^{-10}y^8$
Work Step by Step
$\frac{7x^5y^6}{28x^{15}y^{-2}}=\frac{7}{28}*\frac{x^5}{x^{15}}*\frac{y^6}{y^{-2}}=\frac{1}{4}x^{5-15}y^{6--2}=\frac{1}{4}x^{-10}y^8$
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