$$\frac{a}{5}\times[\frac{-3}{12}]\}+\{\frac{9}{5}+\frac{5}{12}\}$$
$-\frac{a}{20}$
$$\frac{a}{5}\left(-\frac{1}{4}\right)$$
$$\frac{-a}{5\times 4}$$
$$\frac{-a}{20}$$
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$-\frac{1}{20} = -0.05$
