$$[\frac{5}{3}+\frac{-3}{10}]+[\frac{5}{3}+\frac{12}{10}]$$
$\frac{127}{30}\approx 4.233333333$
$$\frac{5}{3}-\frac{3}{10}+\frac{5}{3}+\frac{12}{10}$$
$$\frac{50}{30}-\frac{9}{30}+\frac{5}{3}+\frac{12}{10}$$
$$\frac{50-9}{30}+\frac{5}{3}+\frac{12}{10}$$
$$\frac{41}{30}+\frac{5}{3}+\frac{12}{10}$$
$$\frac{41}{30}+\frac{50}{30}+\frac{12}{10}$$
$$\frac{41+50}{30}+\frac{12}{10}$$
$$\frac{91}{30}+\frac{12}{10}$$
$$\frac{91}{30}+\frac{6}{5}$$
$$\frac{91}{30}+\frac{36}{30}$$
$$\frac{91+36}{30}$$
$$\frac{127}{30}$$
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$\frac{127}{2 \cdot 3 \cdot 5} = 4\frac{7}{30} = 4.233333333333333$
