$$\frac{3}{8}-(-\frac{1}{28})+\frac{5}{12}-\frac{3}{4}$$
$\frac{13}{168}\approx 0.077380952$
$$\frac{3}{8}+\frac{1}{28}+\frac{5}{12}-\frac{3}{4}$$
$$\frac{21}{56}+\frac{2}{56}+\frac{5}{12}-\frac{3}{4}$$
$$\frac{21+2}{56}+\frac{5}{12}-\frac{3}{4}$$
$$\frac{23}{56}+\frac{5}{12}-\frac{3}{4}$$
$$\frac{69}{168}+\frac{70}{168}-\frac{3}{4}$$
$$\frac{69+70}{168}-\frac{3}{4}$$
$$\frac{139}{168}-\frac{3}{4}$$
$$\frac{139}{168}-\frac{126}{168}$$
$$\frac{139-126}{168}$$
$$\frac{13}{168}$$
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$\frac{13}{2 ^ {3} \cdot 3 \cdot 7} = 0.07738095238095238$
