$$-2 \times (-6)+5-8 \div 2+ \sqrt{ 81 }$$
$22$
$$12+5-\frac{8}{2}+\sqrt{81}$$
$$17-\frac{8}{2}+\sqrt{81}$$
$$17-4+\sqrt{81}$$
$$13+\sqrt{81}$$
$$13+9$$
$$22$$
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$2\times 11$
