$$\frac{ (-36) }{ 7 } \times \frac{ (-21) }{ 4 }$$
$27$
$$-\frac{36}{7}\times \frac{-21}{4}$$
$$-\frac{36}{7}\left(-\frac{21}{4}\right)$$
$$\frac{-36\left(-21\right)}{7\times 4}$$
$$\frac{756}{28}$$
$$27$$
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$3^{3}$
