$$72/4 \times \{ 8+4-(-5) \}$$
$306$
$$18\left(8+4-\left(-5\right)\right)$$
$$18\left(12-\left(-5\right)\right)$$
$$18\left(12+5\right)$$
$$18\times 17$$
$$306$$
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$2\times 3^{2}\times 17$