$$\frac { - 3 } { 4 } + [ \frac { - 5 } { 6 } + \frac { 7 } { 3 } ) = ( \frac { 3 } { 9 } + \frac { - 5 } { 6 } ) + \frac { 7 } { 3 }$$
$\text{false}$
$$-\frac{3}{4}+\frac{-5}{6}+\frac{7}{3}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$-\frac{3}{4}-\frac{5}{6}+\frac{7}{3}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$-\frac{9}{12}-\frac{10}{12}+\frac{7}{3}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$\frac{-9-10}{12}+\frac{7}{3}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$-\frac{19}{12}+\frac{7}{3}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$-\frac{19}{12}+\frac{28}{12}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$\frac{-19+28}{12}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$\frac{9}{12}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$\frac{3}{4}=\frac{3}{9}+\frac{-5}{6}+\frac{7}{3}$$
$$\frac{3}{4}=\frac{1}{3}+\frac{-5}{6}+\frac{7}{3}$$
$$\frac{3}{4}=\frac{1}{3}-\frac{5}{6}+\frac{7}{3}$$
$$\frac{3}{4}=\frac{2}{6}-\frac{5}{6}+\frac{7}{3}$$
$$\frac{3}{4}=\frac{2-5}{6}+\frac{7}{3}$$
$$\frac{3}{4}=\frac{-3}{6}+\frac{7}{3}$$
$$\frac{3}{4}=-\frac{1}{2}+\frac{7}{3}$$
$$\frac{3}{4}=-\frac{3}{6}+\frac{14}{6}$$
$$\frac{3}{4}=\frac{-3+14}{6}$$
$$\frac{3}{4}=\frac{11}{6}$$
$$\frac{9}{12}=\frac{22}{12}$$
$$\text{false}$$
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