$$\{390-(3\times25)\}\div16\{16+(40+8)\}$$
$1260$
$$\frac{390-75}{16}\left(16+40+8\right)$$
$$\frac{315}{16}\left(16+40+8\right)$$
$$\frac{315}{16}\left(56+8\right)$$
$$\frac{315}{16}\times 64$$
$$\frac{315\times 64}{16}$$
$$\frac{20160}{16}$$
$$1260$$
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$2^{2}\times 3^{2}\times 5\times 7$
