$$3-[-5 \times 6-4 \times (12/4-5 \times 2)-24/3]$$
$13$
$$3-\left(-30-4\left(\frac{12}{4}-5\times 2\right)-\frac{24}{3}\right)$$
$$3-\left(-30-4\left(3-5\times 2\right)-\frac{24}{3}\right)$$
$$3-\left(-30-4\left(3-10\right)-\frac{24}{3}\right)$$
$$3-\left(-30-4\left(-7\right)-\frac{24}{3}\right)$$
$$3-\left(-30-\left(-28\right)-\frac{24}{3}\right)$$
$$3-\left(-30+28-\frac{24}{3}\right)$$
$$3-\left(-2-\frac{24}{3}\right)$$
$$3-\left(-2-8\right)$$
$$3-\left(-10\right)$$
$$3+10$$
$$13$$
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