$$18+4-3\{3+2(3-2)\}$$
$7$
$$22-3\left(3+2\left(3-2\right)\right)$$
$$22-3\left(3+2\times 1\right)$$
$$22-3\left(3+2\right)$$
$$22-3\times 5$$
$$22-15$$
$$7$$
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