$$\frac{-7}{12}-\frac{-14}{18}$$
$\frac{7}{36}\approx 0.194444444$
$$-\frac{7}{12}-\frac{-14}{18}$$
$$-\frac{7}{12}-\left(-\frac{7}{9}\right)$$
$$-\frac{7}{12}+\frac{7}{9}$$
$$-\frac{21}{36}+\frac{28}{36}$$
$$\frac{-21+28}{36}$$
$$\frac{7}{36}$$
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$\frac{7}{2 ^ {2} \cdot 3 ^ {2}} = 0.19444444444444445$
