$$( \frac { - 9 } { 13 } ) \times ( \frac { - 7 } { 18 } ) - ( \frac { - 9 } { 13 } ) \times ( \frac { - 5 } { 24 } )$$
$\frac{1}{8}=0.125$
$$-\frac{9}{13}\times \frac{-7}{18}-\frac{-9}{13}\times \frac{-5}{24}$$
$$-\frac{9}{13}\left(-\frac{7}{18}\right)-\frac{-9}{13}\times \frac{-5}{24}$$
$$\frac{-9\left(-7\right)}{13\times 18}-\frac{-9}{13}\times \frac{-5}{24}$$
$$\frac{63}{234}-\frac{-9}{13}\times \frac{-5}{24}$$
$$\frac{7}{26}-\frac{-9}{13}\times \frac{-5}{24}$$
$$\frac{7}{26}-\left(-\frac{9}{13}\times \frac{-5}{24}\right)$$
$$\frac{7}{26}-\left(-\frac{9}{13}\left(-\frac{5}{24}\right)\right)$$
$$\frac{7}{26}-\frac{-9\left(-5\right)}{13\times 24}$$
$$\frac{7}{26}-\frac{45}{312}$$
$$\frac{7}{26}-\frac{15}{104}$$
$$\frac{28}{104}-\frac{15}{104}$$
$$\frac{28-15}{104}$$
$$\frac{13}{104}$$
$$\frac{1}{8}$$
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$\frac{1}{2 ^ {3}} = 0.125$
