$$\frac{ 5 }{ 9 } DE \frac{ 8 }{ 40 } DE \frac{ 5 }{ 7 } DEL50$$
$\frac{5L_{50}\left(DE\right)^{3}}{63}$
$$\frac{5}{9}D^{2}E\times \frac{8}{40}E\times \frac{5}{7}DEL_{50}$$
$$\frac{5}{9}D^{3}E\times \frac{8}{40}E\times \frac{5}{7}EL_{50}$$
$$\frac{5}{9}D^{3}E^{2}\times \frac{8}{40}\times \frac{5}{7}EL_{50}$$
$$\frac{5}{9}D^{3}E^{3}\times \frac{8}{40}\times \frac{5}{7}L_{50}$$
$$\frac{5}{9}D^{3}E^{3}\times \frac{1}{5}\times \frac{5}{7}L_{50}$$
$$\frac{5\times 1}{9\times 5}D^{3}E^{3}\times \frac{5}{7}L_{50}$$
$$\frac{1}{9}D^{3}E^{3}\times \frac{5}{7}L_{50}$$
$$\frac{1\times 5}{9\times 7}D^{3}E^{3}L_{50}$$
$$\frac{5}{63}D^{3}E^{3}L_{50}$$
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$\frac{5\left(DE\right)^{3}}{63}$
