$$9/4/27/14-5/18-6/25$$
$-\frac{6449}{12600}\approx -0.511825397$
$$\frac{\frac{9}{4}}{27\times 14}-\frac{5}{18}-\frac{6}{25}$$
$$\frac{\frac{9}{4}}{378}-\frac{5}{18}-\frac{6}{25}$$
$$\frac{9}{4\times 378}-\frac{5}{18}-\frac{6}{25}$$
$$\frac{9}{1512}-\frac{5}{18}-\frac{6}{25}$$
$$\frac{1}{168}-\frac{5}{18}-\frac{6}{25}$$
$$\frac{3}{504}-\frac{140}{504}-\frac{6}{25}$$
$$\frac{3-140}{504}-\frac{6}{25}$$
$$-\frac{137}{504}-\frac{6}{25}$$
$$-\frac{3425}{12600}-\frac{3024}{12600}$$
$$\frac{-3425-3024}{12600}$$
$$-\frac{6449}{12600}$$
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$-\frac{6449}{12600} = -0.5118253968253968$
