$$13-12-5+(-4-5+6-(7-8+1)-6)$$
$-13$
$$1-5+-4-5+6-\left(7-8+1\right)-6$$
$$-4+-4-5+6-\left(7-8+1\right)-6$$
$$-4+-9+6-\left(7-8+1\right)-6$$
$$-4+-3-\left(7-8+1\right)-6$$
$$-4+-3-\left(-1+1\right)-6$$
$$-4+-3-0-6$$
$$-4-3-6$$
$$-7-6$$
$$-13$$
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