$$5-3 \times [(1-2) \times (2-7+3)-5 \times (-2+12/4)]$$
$14$
$$5-3\left(-\left(2-7+3\right)-5\left(-2+\frac{12}{4}\right)\right)$$
$$5-3\left(-\left(-5+3\right)-5\left(-2+\frac{12}{4}\right)\right)$$
$$5-3\left(-\left(-2\right)-5\left(-2+\frac{12}{4}\right)\right)$$
$$5-3\left(2-5\left(-2+\frac{12}{4}\right)\right)$$
$$5-3\left(2-5\left(-2+3\right)\right)$$
$$5-3\left(2-5\times 1\right)$$
$$5-3\left(2-5\right)$$
$$5-3\left(-3\right)$$
$$5-\left(-9\right)$$
$$5+9$$
$$14$$
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$2\times 7$
