$$( 255 - 55 ) \div 4 \times 15 - 504 \div 3$$
$582$
$$\frac{200}{4}\times 15-\frac{504}{3}$$
$$50\times 15-\frac{504}{3}$$
$$750-\frac{504}{3}$$
$$750-168$$
$$582$$
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$2\times 3\times 97$
