$$150 - [ 12 - 3 \{ 5 - ( - 10 + 7 + 8 ) \} ]$$
$138$
$$150-\left(12-3\left(5-\left(-3+8\right)\right)\right)$$
$$150-\left(12-3\left(5-5\right)\right)$$
$$150-\left(12-3\times 0\right)$$
$$150-\left(12-0\right)$$
$$150-12$$
$$138$$
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$2\times 3\times 23$