Answer
$\frac{y(y+8)}{3(y-8)}$
Work Step by Step
$\frac{5y^{2}(y+8)}{15y(y-8)}=\frac{5y^{2}}{15y}\times\frac{(y+8)}{(y-8)}=\frac{y}{3}\times\frac{(y+8)}{(y-8)}=\frac{y(y+8)}{3(y-8)}$
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