$$\frac { - 8 } { 15 } \times \frac { - 9 } { 25 } \times \frac { 20 } { 21 } \times \frac { - 7 } { 10 }$$
$-\frac{16}{125}=-0.128$
$$-\frac{8}{15}\times \frac{-9}{25}\times \frac{20}{21}\times \frac{-7}{10}$$
$$-\frac{8}{15}\left(-\frac{9}{25}\right)\times \frac{20}{21}\times \frac{-7}{10}$$
$$\frac{-8\left(-9\right)}{15\times 25}\times \frac{20}{21}\times \frac{-7}{10}$$
$$\frac{72}{375}\times \frac{20}{21}\times \frac{-7}{10}$$
$$\frac{24}{125}\times \frac{20}{21}\times \frac{-7}{10}$$
$$\frac{24\times 20}{125\times 21}\times \frac{-7}{10}$$
$$\frac{480}{2625}\times \frac{-7}{10}$$
$$\frac{32}{175}\times \frac{-7}{10}$$
$$\frac{32}{175}\left(-\frac{7}{10}\right)$$
$$\frac{32\left(-7\right)}{175\times 10}$$
$$\frac{-224}{1750}$$
$$-\frac{16}{125}$$
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$-\frac{16}{125} = -0.128$
