$$\{ 3 \times (12+16) \} / \{ 16-3(9-6) \}$$
$12$
$$\frac{3\times 28}{16-3\left(9-6\right)}$$
$$\frac{84}{16-3\left(9-6\right)}$$
$$\frac{84}{16-3\times 3}$$
$$\frac{84}{16-9}$$
$$\frac{84}{7}$$
$$12$$
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$2^{2}\times 3$