$$-17+100/(-20) \times 4+(-8 \times 2) \times 2+13$$
$-56$
$$-17-5\times 4-8\times 2\times 2+13$$
$$-17-20-8\times 2\times 2+13$$
$$-37-8\times 2\times 2+13$$
$$-37-16\times 2+13$$
$$-37-32+13$$
$$-69+13$$
$$-56$$
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