$$\left. \begin{array} { l } { 45 } \\ { 40 \times ( - 2 ) + 60 \times ( - 7 ) } \end{array} \right.$$
$-500,45$
$$sort(45,-80-420)$$
$$sort(45,-500)$$
$$45$$
$$-500,45$$
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$45,\ -500$
