$$\left. \begin{array} { l } { 15 - 6 + 7 \times 63 \div 9 - 40 } \\ { 50 } \end{array} \right.$$
$18,\ 50$
$$sort(9+\frac{7\times 63}{9}-40,50)$$
$$sort(9+\frac{441}{9}-40,50)$$
$$sort(9+49-40,50)$$
$$sort(58-40,50)$$
$$sort(18,50)$$
$$18,50$$
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