$$\left. \begin{array} { l } { \quad 4 \times - \frac { 15 } { 2 } } \\ { \quad \frac { 21 } { 8 } \times \frac { 4 } { 14 } } \end{array} \right.$$
$-30,\ \frac{3}{4}$
$$sort(\frac{4\left(-15\right)}{2},\frac{21}{8}\times \frac{4}{14})$$
$$sort(\frac{-60}{2},\frac{21}{8}\times \frac{4}{14})$$
$$sort(-30,\frac{21}{8}\times \frac{4}{14})$$
$$sort(-30,\frac{21}{8}\times \frac{2}{7})$$
$$sort(-30,\frac{21\times 2}{8\times 7})$$
$$sort(-30,\frac{42}{56})$$
$$sort(-30,\frac{3}{4})$$
$$-30,\frac{3}{4}$$
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