$$12x+4[6-(3x+2)]$$
$16$
$$12x+4\left(6-3x-2\right)$$
$$12x+4\left(4-3x\right)$$
$$12x+16-12x$$
$$16$$
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$2^{4}$
$$4\left(3x+6-\left(3x+2\right)\right)$$