$$[- \frac{ 7 }{ 12 } -(- \frac{ 3 }{ 4 } )]- \frac{ 2 }{ 3 }$$
$-\frac{1}{2}=-0.5$
$$-\frac{7}{12}+\frac{3}{4}-\frac{2}{3}$$
$$-\frac{7}{12}+\frac{9}{12}-\frac{2}{3}$$
$$\frac{-7+9}{12}-\frac{2}{3}$$
$$\frac{2}{12}-\frac{2}{3}$$
$$\frac{1}{6}-\frac{2}{3}$$
$$\frac{1}{6}-\frac{4}{6}$$
$$\frac{1-4}{6}$$
$$\frac{-3}{6}$$
$$-\frac{1}{2}$$
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$-\frac{1}{2} = -0.5$
