Answer
$-\frac{17}{25}$
Work Step by Step
$-\frac{17y}{20}\times\frac{4}{5y}=-\frac{17y\times4}{20\times5y}=-\frac{68y}{100y}=-\frac{68y\div4y}{100y\div4y}=-\frac{17}{25}$
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