$$\frac { 2 } { 5 } + \frac { - 3 } { 10 } + \frac { 2 } { 6 } + - 1$$
$-\frac{17}{30}\approx -0.566666667$
$$\frac{2}{5}-\frac{3}{10}+\frac{2}{6}-1$$
$$\frac{4}{10}-\frac{3}{10}+\frac{2}{6}-1$$
$$\frac{4-3}{10}+\frac{2}{6}-1$$
$$\frac{1}{10}+\frac{2}{6}-1$$
$$\frac{1}{10}+\frac{1}{3}-1$$
$$\frac{3}{30}+\frac{10}{30}-1$$
$$\frac{3+10}{30}-1$$
$$\frac{13}{30}-1$$
$$\frac{13}{30}-\frac{30}{30}$$
$$\frac{13-30}{30}$$
$$-\frac{17}{30}$$
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$-\frac{17}{30} = -0.5666666666666667$
