$$\frac{-6}{13}-(\frac{+7}{15})$$
$-\frac{181}{195}\approx -0.928205128$
$$-\frac{6}{13}-\frac{7}{15}$$
$$-\frac{90}{195}-\frac{91}{195}$$
$$\frac{-90-91}{195}$$
$$-\frac{181}{195}$$
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$-\frac{181}{195} = -0.9282051282051282$