$$(\frac{1}{27})-\frac{2}{3}$$
$-\frac{17}{27}\approx -0.62962963$
$$\frac{1}{27}-\frac{18}{27}$$
$$\frac{1-18}{27}$$
$$-\frac{17}{27}$$
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$-\frac{17}{27} = -0.6296296296296297$