$$(5)[\frac{2}{5}\times(\frac{-3}{12})]+[\frac{2}{5}\times\frac{5}{12}]$$
$-\frac{1}{3}\approx -0.333333333$
$$2\times \frac{-3}{12}+\frac{2}{5}\times \frac{5}{12}$$
$$2\left(-\frac{1}{4}\right)+\frac{2}{5}\times \frac{5}{12}$$
$$\frac{2\left(-1\right)}{4}+\frac{2}{5}\times \frac{5}{12}$$
$$\frac{-2}{4}+\frac{2}{5}\times \frac{5}{12}$$
$$-\frac{1}{2}+\frac{2}{5}\times \frac{5}{12}$$
$$-\frac{1}{2}+\frac{2\times 5}{5\times 12}$$
$$-\frac{1}{2}+\frac{2}{12}$$
$$-\frac{1}{2}+\frac{1}{6}$$
$$-\frac{3}{6}+\frac{1}{6}$$
$$\frac{-3+1}{6}$$
$$\frac{-2}{6}$$
$$-\frac{1}{3}$$
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$-\frac{1}{3} = -0.3333333333333333$
