$$\frac{-15}{19}by\frac{30}{38}\rightarrow$$
$-\frac{225by}{361}$
$$-\frac{15}{19}by\times \frac{30}{38}$$
$$-\frac{15}{19}by\times \frac{15}{19}$$
$$\frac{-15\times 15}{19\times 19}by$$
$$\frac{-225}{361}by$$
$$-\frac{225}{361}by$$
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$-\frac{225y}{361}$
