$$16 - 12 \div ( 6 + 2 \times 2 - 13 ) \}$$
$20$
$$16-\frac{12}{6+4-13}$$
$$16-\frac{12}{10-13}$$
$$16-\frac{12}{-3}$$
$$16-\left(-4\right)$$
$$16+4$$
$$20$$
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$2^{2}\times 5$
