$$(\frac{-3}{8})\times(\frac{28}{25})-(\frac{-3}{8})\times(\frac{3}{25})$$
$-\frac{3}{8}=-0.375$
$$-\frac{3}{8}\times \frac{28}{25}-\frac{-3}{8}\times \frac{3}{25}$$
$$\frac{-3\times 28}{8\times 25}-\frac{-3}{8}\times \frac{3}{25}$$
$$\frac{-84}{200}-\frac{-3}{8}\times \frac{3}{25}$$
$$-\frac{21}{50}-\frac{-3}{8}\times \frac{3}{25}$$
$$-\frac{21}{50}-\left(-\frac{3}{8}\times \frac{3}{25}\right)$$
$$-\frac{21}{50}-\frac{-3\times 3}{8\times 25}$$
$$-\frac{21}{50}-\frac{-9}{200}$$
$$-\frac{21}{50}-\left(-\frac{9}{200}\right)$$
$$-\frac{21}{50}+\frac{9}{200}$$
$$-\frac{84}{200}+\frac{9}{200}$$
$$\frac{-84+9}{200}$$
$$\frac{-75}{200}$$
$$-\frac{3}{8}$$
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$-\frac{3}{8} = -0.375$
