$${ 3 }^{ 3 } -6 \times { 3 }^{ 2 } +13 \times 3-7$$
$5$
$$27-6\times 3^{2}+13\times 3-7$$
$$27-6\times 9+13\times 3-7$$
$$27-54+13\times 3-7$$
$$-27+13\times 3-7$$
$$-27+39-7$$
$$12-7$$
$$5$$
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