$$\frac{6}{10}-\frac{12}{6}-; \frac{8}{12}$$
$-\frac{9}{10}=-0.9$
$$\frac{3}{5}\times \frac{-2}{\frac{8}{6}}$$
$$\frac{3}{5}\times \frac{-2\times 6}{8}$$
$$\frac{3}{5}\times \frac{-12}{8}$$
$$\frac{3}{5}\left(-\frac{3}{2}\right)$$
$$\frac{3\left(-3\right)}{5\times 2}$$
$$\frac{-9}{10}$$
$$-\frac{9}{10}$$
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$-\frac{9}{10} = -0.9$