$$83-(25-[8+(16-12)3]$$
$78$
$$83-\left(25-\left(8+4\times 3\right)\right)$$
$$83-\left(25-\left(8+12\right)\right)$$
$$83-\left(25-20\right)$$
$$83-5$$
$$78$$
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$2\times 3\times 13$
