$$12-6/4+3=$$
$\frac{27}{2}=13.5$
$$12-\frac{3}{2}+3$$
$$\frac{24}{2}-\frac{3}{2}+3$$
$$\frac{24-3}{2}+3$$
$$\frac{21}{2}+3$$
$$\frac{21}{2}+\frac{6}{2}$$
$$\frac{21+6}{2}$$
$$\frac{27}{2}$$
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$\frac{3 ^ {3}}{2} = 13\frac{1}{2} = 13.5$