$$18-[2+(7-3-8)-10]$$
$30$
$$18-\left(9-3-8-10\right)$$
$$18-\left(6-8-10\right)$$
$$18-\left(-2-10\right)$$
$$18-\left(-12\right)$$
$$18+12$$
$$30$$
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$2\times 3\times 5$