$$252/52- \frac{ { 82 }^{ 2 } 87513 }{ }$$
$-\frac{7649686293}{13}\approx -588437407.153846154$
$$\frac{63}{13}-\frac{82^{2}\times 87513}{1}$$
$$\frac{63}{13}-\frac{6724\times 87513}{1}$$
$$\frac{63}{13}-\frac{588437412}{1}$$
$$\frac{63}{13}-588437412$$
$$\frac{63}{13}-\frac{7649686356}{13}$$
$$\frac{63-7649686356}{13}$$
$$-\frac{7649686293}{13}$$
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$-\frac{7649686293}{13} = -588437407\frac{2}{13} = -588437407.1538461$