$$4- \{ -12 \div 4+[4-(4 \div -2+12-2)-6] \}$$
$17$
$$4-\left(-3+4-\left(\frac{4}{-2}+12-2\right)-6\right)$$
$$4-\left(-3+4-\left(-2+12-2\right)-6\right)$$
$$4-\left(-3+4-\left(10-2\right)-6\right)$$
$$4-\left(-3+4-8-6\right)$$
$$4-\left(-3-4-6\right)$$
$$4-\left(-7-6\right)$$
$$4-\left(-13\right)$$
$$4+13$$
$$17$$
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