$$(-\frac{1}{3}\times\frac{3}{4})-(-\frac{1}{3}\times\frac{6}{7})$$
$\frac{1}{28}\approx 0.035714286$
$$\frac{-3}{3\times 4}-\left(-\frac{1}{3}\times \frac{6}{7}\right)$$
$$\frac{-1}{4}-\left(-\frac{1}{3}\times \frac{6}{7}\right)$$
$$-\frac{1}{4}-\left(-\frac{1}{3}\times \frac{6}{7}\right)$$
$$-\frac{1}{4}-\frac{-6}{3\times 7}$$
$$-\frac{1}{4}-\frac{-6}{21}$$
$$-\frac{1}{4}-\left(-\frac{2}{7}\right)$$
$$-\frac{1}{4}+\frac{2}{7}$$
$$-\frac{7}{28}+\frac{8}{28}$$
$$\frac{-7+8}{28}$$
$$\frac{1}{28}$$
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$\frac{1}{2 ^ {2} \cdot 7} = 0.03571428571428571$
