$$\frac{6}{10}-\frac{12}{6}+\frac{8}{12}$$
$-\frac{11}{15}\approx -0.733333333$
$$\frac{3}{5}-\frac{12}{6}+\frac{8}{12}$$
$$\frac{3}{5}-2+\frac{8}{12}$$
$$\frac{3}{5}-\frac{10}{5}+\frac{8}{12}$$
$$\frac{3-10}{5}+\frac{8}{12}$$
$$-\frac{7}{5}+\frac{8}{12}$$
$$-\frac{7}{5}+\frac{2}{3}$$
$$-\frac{21}{15}+\frac{10}{15}$$
$$\frac{-21+10}{15}$$
$$-\frac{11}{15}$$
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$-\frac{11}{15} = -0.7333333333333333$
