$$20- \frac{ 10 }{ 27(3 \times 4) }$$
$\frac{3235}{162}\approx 19.969135802$
$$20-\frac{10}{81\times 4}$$
$$20-\frac{10}{324}$$
$$20-\frac{5}{162}$$
$$\frac{3240}{162}-\frac{5}{162}$$
$$\frac{3240-5}{162}$$
$$\frac{3235}{162}$$
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$\frac{5 \cdot 647}{2 \cdot 3 ^ {4}} = 19\frac{157}{162} = 19.969135802469136$
