$$( 9 + 12 ) \div 7 + 36 \div 2 \times 3$$
$57$
$$\frac{21}{7}+\frac{36}{2}\times 3$$
$$3+\frac{36}{2}\times 3$$
$$3+18\times 3$$
$$3+54$$
$$57$$
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$3\times 19$
