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$$\left[1 - \left\{1 - \left(1 + \frac{3}{7}\right)^{-1}\right\}^{-1}\right]^{-1} =$$
$$\frac{3}{10}$$
$$\frac{3}{7}$$
$$-\frac{3}{7}$$
$$-\frac{3}{10}$$
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