$$-3 \times 4+3 \times (15 \div -3)-4 \times (-4+3+6)$$
$-47$
$$-12+3\times \frac{15}{-3}-4\left(-4+3+6\right)$$
$$-12+3\left(-5\right)-4\left(-4+3+6\right)$$
$$-12-15-4\left(-4+3+6\right)$$
$$-27-4\left(-4+3+6\right)$$
$$-27-4\left(-1+6\right)$$
$$-27-4\times 5$$
$$-27-20$$
$$-47$$
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