$$=-9\times\frac{243}{7}$$
$-\frac{2187}{7}\approx -312.428571429$
$$\frac{-9\times 243}{7}$$
$$\frac{-2187}{7}$$
$$-\frac{2187}{7}$$
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$-\frac{2187}{7} = -312\frac{3}{7} = -312.42857142857144$