$$( \frac { - 78 } { 17 } ) \div ( \frac { - 31 } { 51 } )$$
$\frac{234}{31}\approx 7.548387097$
$$\frac{-78\times 51}{17\left(-31\right)}$$
$$\frac{-78\times 3}{-31}$$
$$\frac{-234}{-31}$$
$$\frac{234}{31}$$
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$\frac{2 \cdot 3 ^ {2} \cdot 13}{31} = 7\frac{17}{31} = 7.548387096774194$
