$$\frac{11}{12}+\frac{-17}{4}+\frac{-4}{9}-\frac{-15}{8}$$
$-\frac{137}{72}\approx -1.902777778$
$$\frac{11}{12}-\frac{17}{4}+\frac{-4}{9}-\frac{-15}{8}$$
$$\frac{11}{12}-\frac{51}{12}+\frac{-4}{9}-\frac{-15}{8}$$
$$\frac{11-51}{12}+\frac{-4}{9}-\frac{-15}{8}$$
$$\frac{-40}{12}+\frac{-4}{9}-\frac{-15}{8}$$
$$-\frac{10}{3}+\frac{-4}{9}-\frac{-15}{8}$$
$$-\frac{10}{3}-\frac{4}{9}-\frac{-15}{8}$$
$$-\frac{30}{9}-\frac{4}{9}-\frac{-15}{8}$$
$$\frac{-30-4}{9}-\frac{-15}{8}$$
$$-\frac{34}{9}-\frac{-15}{8}$$
$$-\frac{34}{9}-\left(-\frac{15}{8}\right)$$
$$-\frac{34}{9}+\frac{15}{8}$$
$$-\frac{272}{72}+\frac{135}{72}$$
$$\frac{-272+135}{72}$$
$$-\frac{137}{72}$$
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$-\frac{137}{72} = -1\frac{65}{72} = -1.9027777777777777$
