$$-(-12-8+9-(6+12-7)-9+14-3)$$
$20$
$$-\left(-20+9-\left(6+12-7\right)-9+14-3\right)$$
$$-\left(-11-\left(6+12-7\right)-9+14-3\right)$$
$$-\left(-11-\left(18-7\right)-9+14-3\right)$$
$$-\left(-11-11-9+14-3\right)$$
$$-\left(-22-9+14-3\right)$$
$$-\left(-31+14-3\right)$$
$$-\left(-17-3\right)$$
$$-\left(-20\right)$$
$$20$$
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$2^{2}\times 5$