$$(\frac{2}{3}+\frac{-4}{5}+\frac{7}{15}+\frac{-11}{20})=?$$
$-\frac{13}{60}\approx -0.216666667$
$$\frac{2}{3}-\frac{4}{5}+\frac{7}{15}+\frac{-11}{20}$$
$$\frac{10}{15}-\frac{12}{15}+\frac{7}{15}+\frac{-11}{20}$$
$$\frac{10-12}{15}+\frac{7}{15}+\frac{-11}{20}$$
$$-\frac{2}{15}+\frac{7}{15}+\frac{-11}{20}$$
$$\frac{-2+7}{15}+\frac{-11}{20}$$
$$\frac{5}{15}+\frac{-11}{20}$$
$$\frac{1}{3}+\frac{-11}{20}$$
$$\frac{1}{3}-\frac{11}{20}$$
$$\frac{20}{60}-\frac{33}{60}$$
$$\frac{20-33}{60}$$
$$-\frac{13}{60}$$
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$-\frac{13}{60} = -0.21666666666666667$
