$$- \frac { 1 } { 3 } ( \frac { 3 } { 4 } - \frac { 6 } { 7 } )$$
$\frac{1}{28}\approx 0.035714286$
$$-\frac{1}{3}\left(\frac{21}{28}-\frac{24}{28}\right)$$
$$-\frac{1}{3}\times \frac{21-24}{28}$$
$$-\frac{1}{3}\left(-\frac{3}{28}\right)$$
$$\frac{-\left(-3\right)}{3\times 28}$$
$$\frac{3}{84}$$
$$\frac{1}{28}$$
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$\frac{1}{2 ^ {2} \cdot 7} = 0.03571428571428571$
