$$[(3 \times 7+2)-(5+5-1+8)]=$$
$6$
$$21+2-\left(5+5-1+8\right)$$
$$23-\left(5+5-1+8\right)$$
$$23-\left(10-1+8\right)$$
$$23-\left(9+8\right)$$
$$23-17$$
$$6$$
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$2\times 3$