$$3 \frac { 1 } { 2 } [ 2 + ( - 9 ) ]$$
$-\frac{49}{2}=-24.5$
$$\frac{6+1}{2}\left(2-9\right)$$
$$\frac{7}{2}\left(2-9\right)$$
$$\frac{7}{2}\left(-7\right)$$
$$\frac{7\left(-7\right)}{2}$$
$$\frac{-49}{2}$$
$$-\frac{49}{2}$$
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$-\frac{49}{2} = -24\frac{1}{2} = -24.5$