$$-\frac{7}{9}+(\frac{2}{-3}+\frac{-1}{6})=$$
$-\frac{29}{18}\approx -1.611111111$
$$-\frac{7}{9}-\frac{2}{3}+\frac{-1}{6}$$
$$-\frac{7}{9}-\frac{6}{9}+\frac{-1}{6}$$
$$\frac{-7-6}{9}+\frac{-1}{6}$$
$$-\frac{13}{9}+\frac{-1}{6}$$
$$-\frac{13}{9}-\frac{1}{6}$$
$$-\frac{26}{18}-\frac{3}{18}$$
$$\frac{-26-3}{18}$$
$$-\frac{29}{18}$$
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$-\frac{29}{18} = -1\frac{11}{18} = -1.6111111111111112$
