$$- 13 + ( - 4 ) \div 2 - 3 [ - \{ ( - 3 ) \times ( - 7 ) - ( 3 + 5 ) \} ]$$
$24$
$$-13-2-3\left(-\left(-3\left(-7\right)-\left(3+5\right)\right)\right)$$
$$-15-3\left(-\left(-3\left(-7\right)-\left(3+5\right)\right)\right)$$
$$-15-3\left(-\left(21-\left(3+5\right)\right)\right)$$
$$-15-3\left(-\left(21-8\right)\right)$$
$$-15-3\left(-13\right)$$
$$-15-\left(-39\right)$$
$$-15+39$$
$$24$$
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$2^{3}\times 3$
