$$( 7 + 5 - 9 ) 4 \frac { 9 } { 10 } ( 99 - 100 )$$
$-\frac{147}{10}=-14.7$
$$\left(12-9\right)\times \frac{4\times 10+9}{10}\left(99-100\right)$$
$$3\times \frac{4\times 10+9}{10}\left(99-100\right)$$
$$3\times \frac{40+9}{10}\left(99-100\right)$$
$$3\times \frac{49}{10}\left(99-100\right)$$
$$\frac{3\times 49}{10}\left(99-100\right)$$
$$\frac{147}{10}\left(99-100\right)$$
$$\frac{147}{10}\left(-1\right)$$
$$-\frac{147}{10}$$
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$-\frac{147}{10} = -14\frac{7}{10} = -14.7$
