$$27-[38-\{46-(15-13-12)^{0}\}]$$
$34$
$$27-\left(38-\left(46-\left(2-12\right)^{0}\right)\right)$$
$$27-\left(38-\left(46-\left(-10\right)^{0}\right)\right)$$
$$27-\left(38-\left(46-1\right)\right)$$
$$27-\left(38-45\right)$$
$$27-\left(-7\right)$$
$$27+7$$
$$34$$
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$2\times 17$
