$$\frac{4}{7}by\frac{-2}{5}$$
$-\frac{8by}{35}$
$$\frac{4}{7}by\left(-\frac{2}{5}\right)$$
$$\frac{4\left(-2\right)}{7\times 5}by$$
$$\frac{-8}{35}by$$
$$-\frac{8}{35}by$$
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$-\frac{8y}{35}$