$$- \frac{ 21 }{ 5 } \times \frac{ 24 }{ 7 }$$
$-\frac{72}{5}=-14.4$
$$\frac{-21\times 24}{5\times 7}$$
$$\frac{-504}{35}$$
$$-\frac{72}{5}$$
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$-\frac{72}{5} = -14\frac{2}{5} = -14.4$
