$$\frac{39^{4}}{9^{2}-169^{2}}$$
$-\frac{2313441}{28480}\approx -81.230372191$
$$\frac{2313441}{9^{2}-169^{2}}$$
$$\frac{2313441}{81-169^{2}}$$
$$\frac{2313441}{81-28561}$$
$$\frac{2313441}{-28480}$$
$$-\frac{2313441}{28480}$$
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$-\frac{2313441}{28480} = -81\frac{6561}{28480} = -81.23037219101124$
