$$5-9- \{ 4+[4-(12 \div -6 \times 2+4-3)-5 \div -5] \}$$
$-16$
$$-4-\left(4+4-\left(\frac{12}{-6}\times 2+4-3\right)-\frac{5}{-5}\right)$$
$$-4-\left(4+4-\left(-2\times 2+4-3\right)-\frac{5}{-5}\right)$$
$$-4-\left(4+4-\left(-4+4-3\right)-\frac{5}{-5}\right)$$
$$-4-\left(4+4-\left(-3\right)-\frac{5}{-5}\right)$$
$$-4-\left(4+4+3-\frac{5}{-5}\right)$$
$$-4-\left(4+7-\frac{5}{-5}\right)$$
$$-4-\left(11-\frac{5}{-5}\right)$$
$$-4-\left(11-\left(-1\right)\right)$$
$$-4-\left(11+1\right)$$
$$-4-12$$
$$-16$$
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