$$\frac { 231 \times 2.31 - 180 \times 180 } { 411 }$$
$-\frac{1062213}{13700}\approx -77.53379562$
$$\frac{533.61-180\times 180}{411}$$
$$\frac{533.61-32400}{411}$$
$$\frac{-31866.39}{411}$$
$$\frac{-3186639}{41100}$$
$$-\frac{1062213}{13700}$$
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$-\frac{1062213}{13700} = -77\frac{7313}{13700} = -77.53379562043796$
