$$\frac { 2 } { 3 } + \frac { - 3 } { 5 } + \frac { 1 } { 6 } + \frac { - 8 } { 15 }$$
$-\frac{3}{10}=-0.3$
$$\frac{2}{3}-\frac{3}{5}+\frac{1}{6}+\frac{-8}{15}$$
$$\frac{10}{15}-\frac{9}{15}+\frac{1}{6}+\frac{-8}{15}$$
$$\frac{10-9}{15}+\frac{1}{6}+\frac{-8}{15}$$
$$\frac{1}{15}+\frac{1}{6}+\frac{-8}{15}$$
$$\frac{2}{30}+\frac{5}{30}+\frac{-8}{15}$$
$$\frac{2+5}{30}+\frac{-8}{15}$$
$$\frac{7}{30}+\frac{-8}{15}$$
$$\frac{7}{30}-\frac{8}{15}$$
$$\frac{7}{30}-\frac{16}{30}$$
$$\frac{7-16}{30}$$
$$\frac{-9}{30}$$
$$-\frac{3}{10}$$
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$-\frac{3}{10} = -0.3$
