$$32-[90-5\{9-(14-12)\}]\div5$$
$21$
$$32-\frac{90-5\left(9-2\right)}{5}$$
$$32-\frac{90-5\times 7}{5}$$
$$32-\frac{90-35}{5}$$
$$32-\frac{55}{5}$$
$$32-11$$
$$21$$
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$3\times 7$
