$$80/4-20 \times 2+3 \times 4/4+30$$
$13$
$$20-20\times 2+\frac{3\times 4}{4}+30$$
$$20-40+\frac{3\times 4}{4}+30$$
$$-20+\frac{3\times 4}{4}+30$$
$$-20+3+30$$
$$-17+30$$
$$13$$
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