$$\frac{13}{5}by\frac{-15}{26}$$
$-\frac{3by}{2}$
$$\frac{13}{5}by\left(-\frac{15}{26}\right)$$
$$\frac{13\left(-15\right)}{5\times 26}by$$
$$\frac{-195}{130}by$$
$$-\frac{3}{2}by$$
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$-\frac{3y}{2}$
