$$\frac{-5}{18}+\frac{7}{12}+\frac{-8}{15}+\frac{3}{10}$$
$\frac{13}{180}\approx 0.072222222$
$$-\frac{5}{18}+\frac{7}{12}+\frac{-8}{15}+\frac{3}{10}$$
$$-\frac{10}{36}+\frac{21}{36}+\frac{-8}{15}+\frac{3}{10}$$
$$\frac{-10+21}{36}+\frac{-8}{15}+\frac{3}{10}$$
$$\frac{11}{36}+\frac{-8}{15}+\frac{3}{10}$$
$$\frac{11}{36}-\frac{8}{15}+\frac{3}{10}$$
$$\frac{55}{180}-\frac{96}{180}+\frac{3}{10}$$
$$\frac{55-96}{180}+\frac{3}{10}$$
$$-\frac{41}{180}+\frac{3}{10}$$
$$-\frac{41}{180}+\frac{54}{180}$$
$$\frac{-41+54}{180}$$
$$\frac{13}{180}$$
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$\frac{13}{2 ^ {2} \cdot 3 ^ {2} \cdot 5} = 0.07222222222222222$
