$$\{ 20-(-6+60) \div 9+(24-(-4) \times 2) \}$$
$46$
$$20-\frac{54}{9}+24-\left(-4\times 2\right)$$
$$20-6+24-\left(-4\times 2\right)$$
$$14+24-\left(-4\times 2\right)$$
$$14+24-\left(-8\right)$$
$$14+24+8$$
$$14+32$$
$$46$$
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$2\times 23$
