$$\left. \begin{array} { l } { 50 - ( 15 : 5 ) } \\ { ( 50 - 15 ) : 5 } \end{array} \right.$$
$7,47$
$$sort(50-3,\frac{50-15}{5})$$
$$sort(47,\frac{50-15}{5})$$
$$sort(47,\frac{35}{5})$$
$$sort(47,7)$$
$$47$$
$$7,47$$
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$47,\ 7$