$${ \left( \frac{ 6 }{ 7 } \right) }^{ 3 } \times { \left( \frac{ 7 }{ 6 } \right) }^{ 2 } \times { \left( \frac{ -6 }{ 8 } \right) }^{ 3 }$$
$-\frac{81}{224}\approx -0.361607143$
$$\frac{216}{343}\times \left(\frac{7}{6}\right)^{2}\times \left(\frac{-6}{8}\right)^{3}$$
$$\frac{216}{343}\times \frac{49}{36}\times \left(\frac{-6}{8}\right)^{3}$$
$$\frac{6}{7}\times \left(\frac{-6}{8}\right)^{3}$$
$$\frac{6}{7}\left(-\frac{3}{4}\right)^{3}$$
$$\frac{6}{7}\left(-\frac{27}{64}\right)$$
$$-\frac{81}{224}$$
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$-\frac{81}{224} = -0.36160714285714285$
