$$50-[10-\{70-(9-\overline{8+7})\}]$$
$102$
$$50-\left(10-\left(70-\left(1+7\right)\right)\right)$$
$$50-\left(10-\left(70-8\right)\right)$$
$$50-\left(10-62\right)$$
$$50-\left(-52\right)$$
$$50+52$$
$$102$$
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$2\times 3\times 17$