$$\frac{ 8 }{ 7 } \times \frac{ 8 }{ 14 } \times \frac{ 98 }{ 64 } \times \frac{ 2 }{ 3 }$$
$\frac{2}{3}\approx 0.666666667$
$$\frac{8}{7}\times \frac{4}{7}\times \frac{98}{64}\times \frac{2}{3}$$
$$\frac{8\times 4}{7\times 7}\times \frac{98}{64}\times \frac{2}{3}$$
$$\frac{32}{49}\times \frac{98}{64}\times \frac{2}{3}$$
$$\frac{32}{49}\times \frac{49}{32}\times \frac{2}{3}$$
$$\frac{2}{3}$$
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$\frac{2}{3} = 0.6666666666666666$