$$[20+\{3\times(18-32\div4)\}\div6]\div5$$
$5$
$$\frac{20+\frac{3\left(18-8\right)}{6}}{5}$$
$$\frac{20+\frac{3\times 10}{6}}{5}$$
$$\frac{20+\frac{30}{6}}{5}$$
$$\frac{20+5}{5}$$
$$\frac{25}{5}$$
$$5$$
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