$$\frac{-11}{10}-2\cdot\frac{9}{10}-\frac{6}{5}-\frac{1}{2}$$
$-\frac{23}{5}=-4.6$
$$-\frac{11}{10}-2\times \frac{9}{10}-\frac{6}{5}-\frac{1}{2}$$
$$-\frac{11}{10}-\frac{2\times 9}{10}-\frac{6}{5}-\frac{1}{2}$$
$$-\frac{11}{10}-\frac{18}{10}-\frac{6}{5}-\frac{1}{2}$$
$$\frac{-11-18}{10}-\frac{6}{5}-\frac{1}{2}$$
$$-\frac{29}{10}-\frac{6}{5}-\frac{1}{2}$$
$$-\frac{29}{10}-\frac{12}{10}-\frac{1}{2}$$
$$\frac{-29-12}{10}-\frac{1}{2}$$
$$-\frac{41}{10}-\frac{1}{2}$$
$$-\frac{41}{10}-\frac{5}{10}$$
$$\frac{-41-5}{10}$$
$$\frac{-46}{10}$$
$$-\frac{23}{5}$$
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$-\frac{23}{5} = -4\frac{3}{5} = -4.6$