$$\frac{4}{5}+(\frac{1}{3}+\frac{5}{6})$$
$\frac{59}{30}\approx 1.966666667$
$$\frac{12}{15}+\frac{5}{15}+\frac{5}{6}$$
$$\frac{12+5}{15}+\frac{5}{6}$$
$$\frac{17}{15}+\frac{5}{6}$$
$$\frac{34}{30}+\frac{25}{30}$$
$$\frac{34+25}{30}$$
$$\frac{59}{30}$$
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$\frac{59}{2 \cdot 3 \cdot 5} = 1\frac{29}{30} = 1.9666666666666666$