$$\frac{ 4 }{ 5 } \times \frac{ 3 }{ 7 } \times \frac{ 15 }{ 10 } \times (- \frac{ 14 }{ 9 } )$$
$-\frac{4}{5}=-0.8$
$$\frac{4\times 3}{5\times 7}\times \frac{15}{10}\left(-\frac{14}{9}\right)$$
$$\frac{12}{35}\times \frac{15}{10}\left(-\frac{14}{9}\right)$$
$$\frac{12}{35}\times \frac{3}{2}\left(-\frac{14}{9}\right)$$
$$\frac{12\times 3}{35\times 2}\left(-\frac{14}{9}\right)$$
$$\frac{36}{70}\left(-\frac{14}{9}\right)$$
$$\frac{18}{35}\left(-\frac{14}{9}\right)$$
$$\frac{18\left(-14\right)}{35\times 9}$$
$$\frac{-252}{315}$$
$$-\frac{4}{5}$$
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$-\frac{4}{5} = -0.8$
