$$( \frac { - 12 } { 19 } ) ^ { 7 } \div ( - \frac { 12 } { 19 } ) ^ { 5 }$$
$\frac{144}{361}\approx 0.398891967$
$$\frac{\left(-\frac{12}{19}\right)^{7}}{\left(-\frac{12}{19}\right)^{5}}$$
$$\frac{-\frac{35831808}{893871739}}{\left(-\frac{12}{19}\right)^{5}}$$
$$\frac{-\frac{35831808}{893871739}}{-\frac{248832}{2476099}}$$
$$-\frac{35831808}{893871739}\left(-\frac{2476099}{248832}\right)$$
$$\frac{144}{361}$$
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$\frac{2 ^ {4} \cdot 3 ^ {2}}{19 ^ {2}} = 0.3988919667590028$
